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Simplifying -120 + 9x = 40 + x Solving -120 + 9x = 40 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. -120 + 9x + -1x = 40 + x + -1x Combine like terms: 9x + -1x = 8x -120 + 8x = 40 + x + -1x Combine like terms: x + -1x = 0 -120 + 8x = 40 + 0 -120 + 8x = 40 Add '120' to each side of the equation. -120 + 120 + 8x = 40 + 120 Combine like terms: -120 + 120 = 0 0 + 8x = 40 + 120 8x = 40 + 120 Combine like terms: 40 + 120 = 160 8x = 160 Divide each side by '8'. x = 20 Simplifying x = 20
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