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Simplifying 3x + -1(9x + 4) = 12 + -6x Reorder the terms: 3x + -1(4 + 9x) = 12 + -6x 3x + (4 * -1 + 9x * -1) = 12 + -6x 3x + (-4 + -9x) = 12 + -6x Reorder the terms: -4 + 3x + -9x = 12 + -6x Combine like terms: 3x + -9x = -6x -4 + -6x = 12 + -6x Add '6x' to each side of the equation. -4 + -6x + 6x = 12 + -6x + 6x Combine like terms: -6x + 6x = 0 -4 + 0 = 12 + -6x + 6x -4 = 12 + -6x + 6x Combine like terms: -6x + 6x = 0 -4 = 12 + 0 -4 = 12 Solving -4 = 12 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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