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Simplifying (x + 13) + -1(x + 23) = 90 Reorder the terms: (13 + x) + -1(x + 23) = 90 Remove parenthesis around (13 + x) 13 + x + -1(x + 23) = 90 Reorder the terms: 13 + x + -1(23 + x) = 90 13 + x + (23 * -1 + x * -1) = 90 13 + x + (-23 + -1x) = 90 Reorder the terms: 13 + -23 + x + -1x = 90 Combine like terms: 13 + -23 = -10 -10 + x + -1x = 90 Combine like terms: x + -1x = 0 -10 + 0 = 90 -10 = 90 Solving -10 = 90 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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