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Simplifying -129 = -3x + -6(3x + -3) Reorder the terms: -129 = -3x + -6(-3 + 3x) -129 = -3x + (-3 * -6 + 3x * -6) -129 = -3x + (18 + -18x) Reorder the terms: -129 = 18 + -3x + -18x Combine like terms: -3x + -18x = -21x -129 = 18 + -21x Solving -129 = 18 + -21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21x' to each side of the equation. -129 + 21x = 18 + -21x + 21x Combine like terms: -21x + 21x = 0 -129 + 21x = 18 + 0 -129 + 21x = 18 Add '129' to each side of the equation. -129 + 129 + 21x = 18 + 129 Combine like terms: -129 + 129 = 0 0 + 21x = 18 + 129 21x = 18 + 129 Combine like terms: 18 + 129 = 147 21x = 147 Divide each side by '21'. x = 7 Simplifying x = 7
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