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Simplifying -4(x + 7) + 129 = 30 + 15 Reorder the terms: -4(7 + x) + 129 = 30 + 15 (7 * -4 + x * -4) + 129 = 30 + 15 (-28 + -4x) + 129 = 30 + 15 Reorder the terms: -28 + 129 + -4x = 30 + 15 Combine like terms: -28 + 129 = 101 101 + -4x = 30 + 15 Combine like terms: 30 + 15 = 45 101 + -4x = 45 Solving 101 + -4x = 45 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-101' to each side of the equation. 101 + -101 + -4x = 45 + -101 Combine like terms: 101 + -101 = 0 0 + -4x = 45 + -101 -4x = 45 + -101 Combine like terms: 45 + -101 = -56 -4x = -56 Divide each side by '-4'. x = 14 Simplifying x = 14
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