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Simplifying x + (y + 18) = 90 Reorder the terms: x + (18 + y) = 90 Remove parenthesis around (18 + y) x + 18 + y = 90 Reorder the terms: 18 + x + y = 90 Solving 18 + x + y = 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 + y = 90 + -18 Reorder the terms: 18 + -18 + x + y = 90 + -18 Combine like terms: 18 + -18 = 0 0 + x + y = 90 + -18 x + y = 90 + -18 Combine like terms: 90 + -18 = 72 x + y = 72 Add '-1y' to each side of the equation. x + y + -1y = 72 + -1y Combine like terms: y + -1y = 0 x + 0 = 72 + -1y x = 72 + -1y Simplifying x = 72 + -1y
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