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Simplifying 72 = 2x + (x + -9) Reorder the terms: 72 = 2x + (-9 + x) Remove parenthesis around (-9 + x) 72 = 2x + -9 + x Reorder the terms: 72 = -9 + 2x + x Combine like terms: 2x + x = 3x 72 = -9 + 3x Solving 72 = -9 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 72 + -3x = -9 + 3x + -3x Combine like terms: 3x + -3x = 0 72 + -3x = -9 + 0 72 + -3x = -9 Add '-72' to each side of the equation. 72 + -72 + -3x = -9 + -72 Combine like terms: 72 + -72 = 0 0 + -3x = -9 + -72 -3x = -9 + -72 Combine like terms: -9 + -72 = -81 -3x = -81 Divide each side by '-3'. x = 27 Simplifying x = 27
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