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Simplifying 7r + 20 + -5r = 64 Reorder the terms: 20 + 7r + -5r = 64 Combine like terms: 7r + -5r = 2r 20 + 2r = 64 Solving 20 + 2r = 64 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 = 64 + -20 Combine like terms: 20 + -20 = 0 0 + 2r = 64 + -20 2r = 64 + -20 Combine like terms: 64 + -20 = 44 2r = 44 Divide each side by '2'. r = 22 Simplifying r = 22
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