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Simplifying R + R + 3R + 20 = 90 Reorder the terms: 20 + R + R + 3R = 90 Combine like terms: R + R = 2R 20 + 2R + 3R = 90 Combine like terms: 2R + 3R = 5R 20 + 5R = 90 Solving 20 + 5R = 90 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 + 5R = 90 + -20 Combine like terms: 20 + -20 = 0 0 + 5R = 90 + -20 5R = 90 + -20 Combine like terms: 90 + -20 = 70 5R = 70 Divide each side by '5'. R = 14 Simplifying R = 14
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