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Simplifying -129 + -7x = 8x + 21 Reorder the terms: -129 + -7x = 21 + 8x Solving -129 + -7x = 21 + 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 + -7x + -8x = 21 + 8x + -8x Combine like terms: -7x + -8x = -15x -129 + -15x = 21 + 8x + -8x Combine like terms: 8x + -8x = 0 -129 + -15x = 21 + 0 -129 + -15x = 21 Add '129' to each side of the equation. -129 + 129 + -15x = 21 + 129 Combine like terms: -129 + 129 = 0 0 + -15x = 21 + 129 -15x = 21 + 129 Combine like terms: 21 + 129 = 150 -15x = 150 Divide each side by '-15'. x = -10 Simplifying x = -10
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