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Simplifying (13 + x) + -18 = 31 + x Remove parenthesis around (13 + x) 13 + x + -18 = 31 + x Reorder the terms: 13 + -18 + x = 31 + x Combine like terms: 13 + -18 = -5 -5 + x = 31 + x Add '-1x' to each side of the equation. -5 + x + -1x = 31 + x + -1x Combine like terms: x + -1x = 0 -5 + 0 = 31 + x + -1x -5 = 31 + x + -1x Combine like terms: x + -1x = 0 -5 = 31 + 0 -5 = 31 Solving -5 = 31 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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