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Simplifying -129 = -3x + -5(x + 13) Reorder the terms: -129 = -3x + -5(13 + x) -129 = -3x + (13 * -5 + x * -5) -129 = -3x + (-65 + -5x) Reorder the terms: -129 = -65 + -3x + -5x Combine like terms: -3x + -5x = -8x -129 = -65 + -8x Solving -129 = -65 + -8x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8x' to each side of the equation. -129 + 8x = -65 + -8x + 8x Combine like terms: -8x + 8x = 0 -129 + 8x = -65 + 0 -129 + 8x = -65 Add '129' to each side of the equation. -129 + 129 + 8x = -65 + 129 Combine like terms: -129 + 129 = 0 0 + 8x = -65 + 129 8x = -65 + 129 Combine like terms: -65 + 129 = 64 8x = 64 Divide each side by '8'. x = 8 Simplifying x = 8
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