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Simplifying 9(x + -1) = 9x + 21 Reorder the terms: 9(-1 + x) = 9x + 21 (-1 * 9 + x * 9) = 9x + 21 (-9 + 9x) = 9x + 21 Reorder the terms: -9 + 9x = 21 + 9x Add '-9x' to each side of the equation. -9 + 9x + -9x = 21 + 9x + -9x Combine like terms: 9x + -9x = 0 -9 + 0 = 21 + 9x + -9x -9 = 21 + 9x + -9x Combine like terms: 9x + -9x = 0 -9 = 21 + 0 -9 = 21 Solving -9 = 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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