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Simplifying 20 = 2 + 9r Solving 20 = 2 + 9r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9r' to each side of the equation. 20 + -9r = 2 + 9r + -9r Combine like terms: 9r + -9r = 0 20 + -9r = 2 + 0 20 + -9r = 2 Add '-20' to each side of the equation. 20 + -20 + -9r = 2 + -20 Combine like terms: 20 + -20 = 0 0 + -9r = 2 + -20 -9r = 2 + -20 Combine like terms: 2 + -20 = -18 -9r = -18 Divide each side by '-9'. r = 2 Simplifying r = 2
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