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Simplifying 5r + 8 = 20 + -1r Reorder the terms: 8 + 5r = 20 + -1r Solving 8 + 5r = 20 + -1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add 'r' to each side of the equation. 8 + 5r + r = 20 + -1r + r Combine like terms: 5r + r = 6r 8 + 6r = 20 + -1r + r Combine like terms: -1r + r = 0 8 + 6r = 20 + 0 8 + 6r = 20 Add '-8' to each side of the equation. 8 + -8 + 6r = 20 + -8 Combine like terms: 8 + -8 = 0 0 + 6r = 20 + -8 6r = 20 + -8 Combine like terms: 20 + -8 = 12 6r = 12 Divide each side by '6'. r = 2 Simplifying r = 2
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