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Simplifying -3(3 + -2r) = 6r + 21 (3 * -3 + -2r * -3) = 6r + 21 (-9 + 6r) = 6r + 21 Reorder the terms: -9 + 6r = 21 + 6r Add '-6r' to each side of the equation. -9 + 6r + -6r = 21 + 6r + -6r Combine like terms: 6r + -6r = 0 -9 + 0 = 21 + 6r + -6r -9 = 21 + 6r + -6r Combine like terms: 6r + -6r = 0 -9 = 21 + 0 -9 = 21 Solving -9 = 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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