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Simplifying -18 + 39 = -3(x + 6) Combine like terms: -18 + 39 = 21 21 = -3(x + 6) Reorder the terms: 21 = -3(6 + x) 21 = (6 * -3 + x * -3) 21 = (-18 + -3x) Solving 21 = -18 + -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. 21 + 3x = -18 + -3x + 3x Combine like terms: -3x + 3x = 0 21 + 3x = -18 + 0 21 + 3x = -18 Add '-21' to each side of the equation. 21 + -21 + 3x = -18 + -21 Combine like terms: 21 + -21 = 0 0 + 3x = -18 + -21 3x = -18 + -21 Combine like terms: -18 + -21 = -39 3x = -39 Divide each side by '3'. x = -13 Simplifying x = -13
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