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Simplifying -129 + -7x = 9x + 15 Reorder the terms: -129 + -7x = 15 + 9x Solving -129 + -7x = 15 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. -129 + -7x + -9x = 15 + 9x + -9x Combine like terms: -7x + -9x = -16x -129 + -16x = 15 + 9x + -9x Combine like terms: 9x + -9x = 0 -129 + -16x = 15 + 0 -129 + -16x = 15 Add '129' to each side of the equation. -129 + 129 + -16x = 15 + 129 Combine like terms: -129 + 129 = 0 0 + -16x = 15 + 129 -16x = 15 + 129 Combine like terms: 15 + 129 = 144 -16x = 144 Divide each side by '-16'. x = -9 Simplifying x = -9
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