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Simplifying 129 = 3(-6x + 7) Reorder the terms: 129 = 3(7 + -6x) 129 = (7 * 3 + -6x * 3) 129 = (21 + -18x) Solving 129 = 21 + -18x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '18x' to each side of the equation. 129 + 18x = 21 + -18x + 18x Combine like terms: -18x + 18x = 0 129 + 18x = 21 + 0 129 + 18x = 21 Add '-129' to each side of the equation. 129 + -129 + 18x = 21 + -129 Combine like terms: 129 + -129 = 0 0 + 18x = 21 + -129 18x = 21 + -129 Combine like terms: 21 + -129 = -108 18x = -108 Divide each side by '18'. x = -6 Simplifying x = -6
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