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Simplifying 1 + 10r = 121 Solving 1 + 10r = 121 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 10r = 121 + -1 Combine like terms: 1 + -1 = 0 0 + 10r = 121 + -1 10r = 121 + -1 Combine like terms: 121 + -1 = 120 10r = 120 Divide each side by '10'. r = 12 Simplifying r = 12
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