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Simplifying 7x + 5x + -9 = 3(4x + 9) Reorder the terms: -9 + 7x + 5x = 3(4x + 9) Combine like terms: 7x + 5x = 12x -9 + 12x = 3(4x + 9) Reorder the terms: -9 + 12x = 3(9 + 4x) -9 + 12x = (9 * 3 + 4x * 3) -9 + 12x = (27 + 12x) Add '-12x' to each side of the equation. -9 + 12x + -12x = 27 + 12x + -12x Combine like terms: 12x + -12x = 0 -9 + 0 = 27 + 12x + -12x -9 = 27 + 12x + -12x Combine like terms: 12x + -12x = 0 -9 = 27 + 0 -9 = 27 Solving -9 = 27 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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