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Simplifying 12x + -3(x + -4) = 9x + -9 Reorder the terms: 12x + -3(-4 + x) = 9x + -9 12x + (-4 * -3 + x * -3) = 9x + -9 12x + (12 + -3x) = 9x + -9 Reorder the terms: 12 + 12x + -3x = 9x + -9 Combine like terms: 12x + -3x = 9x 12 + 9x = 9x + -9 Reorder the terms: 12 + 9x = -9 + 9x Add '-9x' to each side of the equation. 12 + 9x + -9x = -9 + 9x + -9x Combine like terms: 9x + -9x = 0 12 + 0 = -9 + 9x + -9x 12 = -9 + 9x + -9x Combine like terms: 9x + -9x = 0 12 = -9 + 0 12 = -9 Solving 12 = -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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