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Simplifying -81 + -2x = -9x + 129 Reorder the terms: -81 + -2x = 129 + -9x Solving -81 + -2x = 129 + -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. -81 + -2x + 9x = 129 + -9x + 9x Combine like terms: -2x + 9x = 7x -81 + 7x = 129 + -9x + 9x Combine like terms: -9x + 9x = 0 -81 + 7x = 129 + 0 -81 + 7x = 129 Add '81' to each side of the equation. -81 + 81 + 7x = 129 + 81 Combine like terms: -81 + 81 = 0 0 + 7x = 129 + 81 7x = 129 + 81 Combine like terms: 129 + 81 = 210 7x = 210 Divide each side by '7'. x = 30 Simplifying x = 30
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