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Simplifying 12(6 + -6x) + 9x = -9(2 + 7x) (6 * 12 + -6x * 12) + 9x = -9(2 + 7x) (72 + -72x) + 9x = -9(2 + 7x) Combine like terms: -72x + 9x = -63x 72 + -63x = -9(2 + 7x) 72 + -63x = (2 * -9 + 7x * -9) 72 + -63x = (-18 + -63x) Add '63x' to each side of the equation. 72 + -63x + 63x = -18 + -63x + 63x Combine like terms: -63x + 63x = 0 72 + 0 = -18 + -63x + 63x 72 = -18 + -63x + 63x Combine like terms: -63x + 63x = 0 72 = -18 + 0 72 = -18 Solving 72 = -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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