Find the value of: [836 ÷ {30 + 2 × ( 7 − 3 )}].
Expression:
836 ÷ {30 + 2 × (7 − 3)}
Step 1: Bracket
(7 − 3) = 4
Step 2: Multiply
2 × 4 = 8
Step 3: Inside bracket
30 + 8 = 38
Step 4: Divide
836 ÷ 38 = 22
Evaluate: (-9) - (-60) $ \div $ (-10) + (-3) × 8
Simplify: $4\left((\frac{6}{4})x^2 - 25x + 12\right) - 6(x^2 + 5x - 13)$.