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Simplifying r = -9r + -20 Reorder the terms: r = -20 + -9r Solving r = -20 + -9r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '9r' to each side of the equation. r + 9r = -20 + -9r + 9r Combine like terms: r + 9r = 10r 10r = -20 + -9r + 9r Combine like terms: -9r + 9r = 0 10r = -20 + 0 10r = -20 Divide each side by '10'. r = -2 Simplifying r = -2
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