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Simplifying 9x + -12 = 9(x + -1) + 4 Reorder the terms: -12 + 9x = 9(x + -1) + 4 Reorder the terms: -12 + 9x = 9(-1 + x) + 4 -12 + 9x = (-1 * 9 + x * 9) + 4 -12 + 9x = (-9 + 9x) + 4 Reorder the terms: -12 + 9x = -9 + 4 + 9x Combine like terms: -9 + 4 = -5 -12 + 9x = -5 + 9x Add '-9x' to each side of the equation. -12 + 9x + -9x = -5 + 9x + -9x Combine like terms: 9x + -9x = 0 -12 + 0 = -5 + 9x + -9x -12 = -5 + 9x + -9x Combine like terms: 9x + -9x = 0 -12 = -5 + 0 -12 = -5 Solving -12 = -5 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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