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Simplifying 31 = 8r + 5r Combine like terms: 8r + 5r = 13r 31 = 13r Solving 31 = 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. 31 + -13r = 13r + -13r Combine like terms: 13r + -13r = 0 31 + -13r = 0 Add '-31' to each side of the equation. 31 + -31 + -13r = 0 + -31 Combine like terms: 31 + -31 = 0 0 + -13r = 0 + -31 -13r = 0 + -31 Combine like terms: 0 + -31 = -31 -13r = -31 Divide each side by '-13'. r = 2.384615385 Simplifying r = 2.384615385
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