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Simplifying -2(3x + 6) + 9 = -6x + 21 Reorder the terms: -2(6 + 3x) + 9 = -6x + 21 (6 * -2 + 3x * -2) + 9 = -6x + 21 (-12 + -6x) + 9 = -6x + 21 Reorder the terms: -12 + 9 + -6x = -6x + 21 Combine like terms: -12 + 9 = -3 -3 + -6x = -6x + 21 Reorder the terms: -3 + -6x = 21 + -6x Add '6x' to each side of the equation. -3 + -6x + 6x = 21 + -6x + 6x Combine like terms: -6x + 6x = 0 -3 + 0 = 21 + -6x + 6x -3 = 21 + -6x + 6x Combine like terms: -6x + 6x = 0 -3 = 21 + 0 -3 = 21 Solving -3 = 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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