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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 Solving 18 + X + x = 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 + X + -18 + x = 90 + -18 Reorder the terms: 18 + -18 + X + x = 90 + -18 Combine like terms: 18 + -18 = 0 0 + X + x = 90 + -18 X + x = 90 + -18 Combine like terms: 90 + -18 = 72 X + x = 72 Add '-1x' to each side of the equation. X + x + -1x = 72 + -1x Combine like terms: x + -1x = 0 X + 0 = 72 + -1x X = 72 + -1x Simplifying X = 72 + -1x
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