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Simplifying -81 + 9x = 129 + -1x Solving -81 + 9x = 129 + -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. -81 + 9x + x = 129 + -1x + x Combine like terms: 9x + x = 10x -81 + 10x = 129 + -1x + x Combine like terms: -1x + x = 0 -81 + 10x = 129 + 0 -81 + 10x = 129 Add '81' to each side of the equation. -81 + 81 + 10x = 129 + 81 Combine like terms: -81 + 81 = 0 0 + 10x = 129 + 81 10x = 129 + 81 Combine like terms: 129 + 81 = 210 10x = 210 Divide each side by '10'. x = 21 Simplifying x = 21
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