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Simplifying r + 8r + -5r = -20 Combine like terms: r + 8r = 9r 9r + -5r = -20 Combine like terms: 9r + -5r = 4r 4r = -20 Solving 4r = -20 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Divide each side by '4'. r = -5 Simplifying r = -5
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