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Simplifying 1x + (2x + -1) + (3x + -2) = 87 Reorder the terms: 1x + (-1 + 2x) + (3x + -2) = 87 Remove parenthesis around (-1 + 2x) 1x + -1 + 2x + (3x + -2) = 87 Reorder the terms: 1x + -1 + 2x + (-2 + 3x) = 87 Remove parenthesis around (-2 + 3x) 1x + -1 + 2x + -2 + 3x = 87 Reorder the terms: -1 + -2 + 1x + 2x + 3x = 87 Combine like terms: -1 + -2 = -3 -3 + 1x + 2x + 3x = 87 Combine like terms: 1x + 2x = 3x -3 + 3x + 3x = 87 Combine like terms: 3x + 3x = 6x -3 + 6x = 87 Solving -3 + 6x = 87 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 6x = 87 + 3 Combine like terms: -3 + 3 = 0 0 + 6x = 87 + 3 6x = 87 + 3 Combine like terms: 87 + 3 = 90 6x = 90 Divide each side by '6'. x = 15 Simplifying x = 15
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