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Simplifying 3(4x + -21) = 12x Reorder the terms: 3(-21 + 4x) = 12x (-21 * 3 + 4x * 3) = 12x (-63 + 12x) = 12x Add '-12x' to each side of the equation. -63 + 12x + -12x = 12x + -12x Combine like terms: 12x + -12x = 0 -63 + 0 = 12x + -12x -63 = 12x + -12x Combine like terms: 12x + -12x = 0 -63 = 0 Solving -63 = 0 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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