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Simplifying (x + -7) = x + -21 Reorder the terms: (-7 + x) = x + -21 Remove parenthesis around (-7 + x) -7 + x = x + -21 Reorder the terms: -7 + x = -21 + x Add '-1x' to each side of the equation. -7 + x + -1x = -21 + x + -1x Combine like terms: x + -1x = 0 -7 + 0 = -21 + x + -1x -7 = -21 + x + -1x Combine like terms: x + -1x = 0 -7 = -21 + 0 -7 = -21 Solving -7 = -21 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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