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Simplifying r + r + 20 = 100 Reorder the terms: 20 + r + r = 100 Combine like terms: r + r = 2r 20 + 2r = 100 Solving 20 + 2r = 100 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 + 2r = 100 + -20 Combine like terms: 20 + -20 = 0 0 + 2r = 100 + -20 2r = 100 + -20 Combine like terms: 100 + -20 = 80 2r = 80 Divide each side by '2'. r = 40 Simplifying r = 40
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