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Simplifying 20 = -5r + -8r Combine like terms: -5r + -8r = -13r 20 = -13r Solving 20 = -13r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '13r' to each side of the equation. 20 + 13r = -13r + 13r Combine like terms: -13r + 13r = 0 20 + 13r = 0 Add '-20' to each side of the equation. 20 + -20 + 13r = 0 + -20 Combine like terms: 20 + -20 = 0 0 + 13r = 0 + -20 13r = 0 + -20 Combine like terms: 0 + -20 = -20 13r = -20 Divide each side by '13'. r = -1.538461538 Simplifying r = -1.538461538
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