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Simplifying (90 + y) + (15 + -1y) = 387 Remove parenthesis around (90 + y) 90 + y + (15 + -1y) = 387 Remove parenthesis around (15 + -1y) 90 + y + 15 + -1y = 387 Reorder the terms: 90 + 15 + y + -1y = 387 Combine like terms: 90 + 15 = 105 105 + y + -1y = 387 Combine like terms: y + -1y = 0 105 + 0 = 387 105 = 387 Solving 105 = 387 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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