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Simplifying -21 + x = x + 18 Reorder the terms: -21 + x = 18 + x Add '-1x' to each side of the equation. -21 + x + -1x = 18 + x + -1x Combine like terms: x + -1x = 0 -21 + 0 = 18 + x + -1x -21 = 18 + x + -1x Combine like terms: x + -1x = 0 -21 = 18 + 0 -21 = 18 Solving -21 = 18 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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