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Question

If 5x + 5 (2 - x) + 10 = 4x - 6 then value of x is :

The correct answer is

6.5

Solving the Algebraic Equation

The question asks us to find the value of the variable x in the given linear equation:

$$5x + 5(2 - x) + 10 = 4x - 6$$

We need to simplify this equation step-by-step to isolate x.

Simplifying the Expression

First, let's distribute the 5 across the terms inside the parentheses on the left side of the equation:

$$5x + (5 \times 2) - (5 \times x) + 10 = 4x - 6$$

$$5x + 10 - 5x + 10 = 4x - 6$$

Now, combine the like terms on the left side. The terms involving x are 5x and -5x, and the constant terms are 10 and 10.

$$ (5x - 5x) + (10 + 10) = 4x - 6 $$

$$ 0x + 20 = 4x - 6 $$

$$ 20 = 4x - 6 $$

Calculating the Value of x

Next, we want to get all the terms involving x on one side and the constant terms on the other side. Let's add 6 to both sides of the equation:

$$ 20 + 6 = 4x - 6 + 6 $$

$$ 26 = 4x $$

Finally, to find the value of x, divide both sides by 4:

$$ \frac{26}{4} = \frac{4x}{4} $$

$$ x = \frac{26}{4} $$

Performing the division:

$$ x = 6.5 $$

Conclusion

The calculated value of x is 6.5. This matches the third option provided.

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Important Questions from Linear Equation in 1 Variable

  1. If a school of fish weighs 3 kg and each fish in the school weighs 150g, then the number of fish in the school is____.

  2. What should be subtracted from p and added to q so that the resulting ratio becomes 1 : 5?

  3. The cost of a pen is five times the cost of a pencil. I bought 8 pens and 4 pencils for Rs. 132. Find the cost of 5 pens and 5 pencils.

  4. Find the value of k, for which the system of equations kx + 3y = 26 and 21x + (k + 2)y = 71 + k has infinitely many solutions.

  5. If 2x 2 + 5x + 1 = 0, then one of the values of  \(\frac{1}{2}\left( {x\, - \,\frac{1}{{2x}}} \right)\)  is:

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