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Simplifying -1(4 + -2r) = 2r + -12 (4 * -1 + -2r * -1) = 2r + -12 (-4 + 2r) = 2r + -12 Reorder the terms: -4 + 2r = -12 + 2r Add '-2r' to each side of the equation. -4 + 2r + -2r = -12 + 2r + -2r Combine like terms: 2r + -2r = 0 -4 + 0 = -12 + 2r + -2r -4 = -12 + 2r + -2r Combine like terms: 2r + -2r = 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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