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Simplifying 129 = 3(-7x + 7) + -6x Reorder the terms: 129 = 3(7 + -7x) + -6x 129 = (7 * 3 + -7x * 3) + -6x 129 = (21 + -21x) + -6x Combine like terms: -21x + -6x = -27x 129 = 21 + -27x Solving 129 = 21 + -27x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '27x' to each side of the equation. 129 + 27x = 21 + -27x + 27x Combine like terms: -27x + 27x = 0 129 + 27x = 21 + 0 129 + 27x = 21 Add '-129' to each side of the equation. 129 + -129 + 27x = 21 + -129 Combine like terms: 129 + -129 = 0 0 + 27x = 21 + -129 27x = 21 + -129 Combine like terms: 21 + -129 = -108 27x = -108 Divide each side by '27'. x = -4 Simplifying x = -4
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