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Simplifying x + (-18 + x) = 90 Remove parenthesis around (-18 + x) x + -18 + x = 90 Reorder the terms: -18 + x + x = 90 Combine like terms: x + x = 2x -18 + 2x = 90 Solving -18 + 2x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + 2x = 90 + 18 Combine like terms: -18 + 18 = 0 0 + 2x = 90 + 18 2x = 90 + 18 Combine like terms: 90 + 18 = 108 2x = 108 Divide each side by '2'. x = 54 Simplifying x = 54
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