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Simplifying 9 + -2(-6x + 9) = -21 + 12x Reorder the terms: 9 + -2(9 + -6x) = -21 + 12x 9 + (9 * -2 + -6x * -2) = -21 + 12x 9 + (-18 + 12x) = -21 + 12x Combine like terms: 9 + -18 = -9 -9 + 12x = -21 + 12x Add '-12x' to each side of the equation. -9 + 12x + -12x = -21 + 12x + -12x Combine like terms: 12x + -12x = 0 -9 + 0 = -21 + 12x + -12x -9 = -21 + 12x + -12x Combine like terms: 12x + -12x = 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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