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Simplifying -4[6 + -1(-2 + 3x)] = 21 + 12x -4[6 + (-2 * -1 + 3x * -1)] = 21 + 12x -4[6 + (2 + -3x)] = 21 + 12x Combine like terms: 6 + 2 = 8 -4[8 + -3x] = 21 + 12x [8 * -4 + -3x * -4] = 21 + 12x [-32 + 12x] = 21 + 12x Add '-12x' to each side of the equation. -32 + 12x + -12x = 21 + 12x + -12x Combine like terms: 12x + -12x = 0 -32 + 0 = 21 + 12x + -12x -32 = 21 + 12x + -12x Combine like terms: 12x + -12x = 0 -32 = 21 + 0 -32 = 21 Solving -32 = 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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