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Simplifying 4(5r + 5) = 160 Reorder the terms: 4(5 + 5r) = 160 (5 * 4 + 5r * 4) = 160 (20 + 20r) = 160 Solving 20 + 20r = 160 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + 20r = 160 + -20 Combine like terms: 20 + -20 = 0 0 + 20r = 160 + -20 20r = 160 + -20 Combine like terms: 160 + -20 = 140 20r = 140 Divide each side by '20'. r = 7 Simplifying r = 7
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