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Simplifying x = (21 + x) + -6 Remove parenthesis around (21 + x) x = 21 + x + -6 Reorder the terms: x = 21 + -6 + x Combine like terms: 21 + -6 = 15 x = 15 + x Add '-1x' to each side of the equation. x + -1x = 15 + x + -1x Combine like terms: x + -1x = 0 0 = 15 + x + -1x Combine like terms: x + -1x = 0 0 = 15 + 0 0 = 15 Solving 0 = 15 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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