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Simplifying 3(1 + 7r) = 108 (1 * 3 + 7r * 3) = 108 (3 + 21r) = 108 Solving 3 + 21r = 108 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 21r = 108 + -3 Combine like terms: 3 + -3 = 0 0 + 21r = 108 + -3 21r = 108 + -3 Combine like terms: 108 + -3 = 105 21r = 105 Divide each side by '21'. r = 5 Simplifying r = 5
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