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