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Simplifying 129 = 3 + 7(3x + -3) Reorder the terms: 129 = 3 + 7(-3 + 3x) 129 = 3 + (-3 * 7 + 3x * 7) 129 = 3 + (-21 + 21x) Combine like terms: 3 + -21 = -18 129 = -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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