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Simplifying 3x + -1(7x + 9) = 15 + -4x Reorder the terms: 3x + -1(9 + 7x) = 15 + -4x 3x + (9 * -1 + 7x * -1) = 15 + -4x 3x + (-9 + -7x) = 15 + -4x Reorder the terms: -9 + 3x + -7x = 15 + -4x Combine like terms: 3x + -7x = -4x -9 + -4x = 15 + -4x Add '4x' to each side of the equation. -9 + -4x + 4x = 15 + -4x + 4x Combine like terms: -4x + 4x = 0 -9 + 0 = 15 + -4x + 4x -9 = 15 + -4x + 4x Combine like terms: -4x + 4x = 0 -9 = 15 + 0 -9 = 15 Solving -9 = 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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