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Simplifying 2x + (x + -1) = 89 Reorder the terms: 2x + (-1 + x) = 89 Remove parenthesis around (-1 + x) 2x + -1 + x = 89 Reorder the terms: -1 + 2x + x = 89 Combine like terms: 2x + x = 3x -1 + 3x = 89 Solving -1 + 3x = 89 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 3x = 89 + 1 Combine like terms: -1 + 1 = 0 0 + 3x = 89 + 1 3x = 89 + 1 Combine like terms: 89 + 1 = 90 3x = 90 Divide each side by '3'. x = 30 Simplifying x = 30
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