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Simplifying 10(4r + -1r + 1) = 220 Reorder the terms: 10(1 + 4r + -1r) = 220 Combine like terms: 4r + -1r = 3r 10(1 + 3r) = 220 (1 * 10 + 3r * 10) = 220 (10 + 30r) = 220 Solving 10 + 30r = 220 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + 30r = 220 + -10 Combine like terms: 10 + -10 = 0 0 + 30r = 220 + -10 30r = 220 + -10 Combine like terms: 220 + -10 = 210 30r = 210 Divide each side by '30'. r = 7 Simplifying r = 7
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