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Simplifying -12 + -1(r + -9) = 21 + -1r Reorder the terms: -12 + -1(-9 + r) = 21 + -1r -12 + (-9 * -1 + r * -1) = 21 + -1r -12 + (9 + -1r) = 21 + -1r Combine like terms: -12 + 9 = -3 -3 + -1r = 21 + -1r Add 'r' to each side of the equation. -3 + -1r + r = 21 + -1r + r Combine like terms: -1r + r = 0 -3 + 0 = 21 + -1r + r -3 = 21 + -1r + r Combine like terms: -1r + r = 0 -3 = 21 + 0 -3 = 21 Solving -3 = 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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