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Simplifying (R + 9) * 20 = 140 Reorder the terms: (9 + R) * 20 = 140 Reorder the terms for easier multiplication: 20(9 + R) = 140 (9 * 20 + R * 20) = 140 (180 + 20R) = 140 Solving 180 + 20R = 140 Solving for variable 'R'. Move all terms containing R to the left, all other terms to the right. Add '-180' to each side of the equation. 180 + -180 + 20R = 140 + -180 Combine like terms: 180 + -180 = 0 0 + 20R = 140 + -180 20R = 140 + -180 Combine like terms: 140 + -180 = -40 20R = -40 Divide each side by '20'. R = -2 Simplifying R = -2
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