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Simplifying 36 + -18 = 3(x + -7) Combine like terms: 36 + -18 = 18 18 = 3(x + -7) Reorder the terms: 18 = 3(-7 + x) 18 = (-7 * 3 + x * 3) 18 = (-21 + 3x) Solving 18 = -21 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 18 + -3x = -21 + 3x + -3x Combine like terms: 3x + -3x = 0 18 + -3x = -21 + 0 18 + -3x = -21 Add '-18' to each side of the equation. 18 + -18 + -3x = -21 + -18 Combine like terms: 18 + -18 = 0 0 + -3x = -21 + -18 -3x = -21 + -18 Combine like terms: -21 + -18 = -39 -3x = -39 Divide each side by '-3'. x = 13 Simplifying x = 13
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