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Simplifying 3r + 8r + 5r = 4r + 20 Combine like terms: 3r + 8r = 11r 11r + 5r = 4r + 20 Combine like terms: 11r + 5r = 16r 16r = 4r + 20 Reorder the terms: 16r = 20 + 4r Solving 16r = 20 + 4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4r' to each side of the equation. 16r + -4r = 20 + 4r + -4r Combine like terms: 16r + -4r = 12r 12r = 20 + 4r + -4r Combine like terms: 4r + -4r = 0 12r = 20 + 0 12r = 20 Divide each side by '12'. r = 1.666666667 Simplifying r = 1.666666667
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