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Simplifying 4r + 4(r + 20) = 120 Reorder the terms: 4r + 4(20 + r) = 120 4r + (20 * 4 + r * 4) = 120 4r + (80 + 4r) = 120 Reorder the terms: 80 + 4r + 4r = 120 Combine like terms: 4r + 4r = 8r 80 + 8r = 120 Solving 80 + 8r = 120 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-80' to each side of the equation. 80 + -80 + 8r = 120 + -80 Combine like terms: 80 + -80 = 0 0 + 8r = 120 + -80 8r = 120 + -80 Combine like terms: 120 + -80 = 40 8r = 40 Divide each side by '8'. r = 5 Simplifying r = 5
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