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Simplifying (91 + -1x) + (x + 7) = 180 Remove parenthesis around (91 + -1x) 91 + -1x + (x + 7) = 180 Reorder the terms: 91 + -1x + (7 + x) = 180 Remove parenthesis around (7 + x) 91 + -1x + 7 + x = 180 Reorder the terms: 91 + 7 + -1x + x = 180 Combine like terms: 91 + 7 = 98 98 + -1x + x = 180 Combine like terms: -1x + x = 0 98 + 0 = 180 98 = 180 Solving 98 = 180 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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