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Simplifying -1(9x + -4) + 9x = 0 Reorder the terms: -1(-4 + 9x) + 9x = 0 (-4 * -1 + 9x * -1) + 9x = 0 (4 + -9x) + 9x = 0 Combine like terms: -9x + 9x = 0 4 + 0 = 0 4 = 0 Solving 4 = 0 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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