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Simplifying -12u + -21 = 4(-3u + -7) Reorder the terms: -21 + -12u = 4(-3u + -7) Reorder the terms: -21 + -12u = 4(-7 + -3u) -21 + -12u = (-7 * 4 + -3u * 4) -21 + -12u = (-28 + -12u) Add '12u' to each side of the equation. -21 + -12u + 12u = -28 + -12u + 12u Combine like terms: -12u + 12u = 0 -21 + 0 = -28 + -12u + 12u -21 = -28 + -12u + 12u Combine like terms: -12u + 12u = 0 -21 = -28 + 0 -21 = -28 Solving -21 = -28 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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