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Simplifying 12x + -9 = 3(4x + 7) Reorder the terms: -9 + 12x = 3(4x + 7) Reorder the terms: -9 + 12x = 3(7 + 4x) -9 + 12x = (7 * 3 + 4x * 3) -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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