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Simplifying x + 2x + (x + -9) = 87 Reorder the terms: x + 2x + (-9 + x) = 87 Remove parenthesis around (-9 + x) x + 2x + -9 + x = 87 Reorder the terms: -9 + x + 2x + x = 87 Combine like terms: x + 2x = 3x -9 + 3x + x = 87 Combine like terms: 3x + x = 4x -9 + 4x = 87 Solving -9 + 4x = 87 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 4x = 87 + 9 Combine like terms: -9 + 9 = 0 0 + 4x = 87 + 9 4x = 87 + 9 Combine like terms: 87 + 9 = 96 4x = 96 Divide each side by '4'. x = 24 Simplifying x = 24
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