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Simplifying 3x + 9x + -7 = 3(4x + 5) Reorder the terms: -7 + 3x + 9x = 3(4x + 5) Combine like terms: 3x + 9x = 12x -7 + 12x = 3(4x + 5) Reorder the terms: -7 + 12x = 3(5 + 4x) -7 + 12x = (5 * 3 + 4x * 3) -7 + 12x = (15 + 12x) Add '-12x' to each side of the equation. -7 + 12x + -12x = 15 + 12x + -12x Combine like terms: 12x + -12x = 0 -7 + 0 = 15 + 12x + -12x -7 = 15 + 12x + -12x Combine like terms: 12x + -12x = 0 -7 = 15 + 0 -7 = 15 Solving -7 = 15 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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