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Simplifying 9r = 20 + -1r Solving 9r = 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. 9r + r = 20 + -1r + r Combine like terms: 9r + r = 10r 10r = 20 + -1r + r Combine like terms: -1r + r = 0 10r = 20 + 0 10r = 20 Divide each side by '10'. r = 2 Simplifying r = 2
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