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Simplifying (51 + x) + -9 = x Remove parenthesis around (51 + x) 51 + x + -9 = x Reorder the terms: 51 + -9 + x = x Combine like terms: 51 + -9 = 42 42 + x = x Add '-1x' to each side of the equation. 42 + x + -1x = x + -1x Combine like terms: x + -1x = 0 42 + 0 = x + -1x 42 = x + -1x Combine like terms: x + -1x = 0 42 = 0 Solving 42 = 0 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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