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Simplifying 129 = 7x + -3(x + 3) Reorder the terms: 129 = 7x + -3(3 + x) 129 = 7x + (3 * -3 + x * -3) 129 = 7x + (-9 + -3x) Reorder the terms: 129 = -9 + 7x + -3x Combine like terms: 7x + -3x = 4x 129 = -9 + 4x Solving 129 = -9 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 129 + -4x = -9 + 4x + -4x Combine like terms: 4x + -4x = 0 129 + -4x = -9 + 0 129 + -4x = -9 Add '-129' to each side of the equation. 129 + -129 + -4x = -9 + -129 Combine like terms: 129 + -129 = 0 0 + -4x = -9 + -129 -4x = -9 + -129 Combine like terms: -9 + -129 = -138 -4x = -138 Divide each side by '-4'. x = 34.5 Simplifying x = 34.5
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