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Simplifying 13r + 11r + 4 = 20 Reorder the terms: 4 + 13r + 11r = 20 Combine like terms: 13r + 11r = 24r 4 + 24r = 20 Solving 4 + 24r = 20 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 24r = 20 + -4 Combine like terms: 4 + -4 = 0 0 + 24r = 20 + -4 24r = 20 + -4 Combine like terms: 20 + -4 = 16 24r = 16 Divide each side by '24'. r = 0.6666666667 Simplifying r = 0.6666666667
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