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Simplifying X + (X + -18) = 90 Reorder the terms: 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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