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Simplifying 3(-7 + -4x) = -12x + -3 (-7 * 3 + -4x * 3) = -12x + -3 (-21 + -12x) = -12x + -3 Reorder the terms: -21 + -12x = -3 + -12x Add '12x' to each side of the equation. -21 + -12x + 12x = -3 + -12x + 12x Combine like terms: -12x + 12x = 0 -21 + 0 = -3 + -12x + 12x -21 = -3 + -12x + 12x Combine like terms: -12x + 12x = 0 -21 = -3 + 0 -21 = -3 Solving -21 = -3 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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