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Simplifying r + r + 18 = 100 Reorder the terms: 18 + r + r = 100 Combine like terms: r + r = 2r 18 + 2r = 100 Solving 18 + 2r = 100 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + 2r = 100 + -18 Combine like terms: 18 + -18 = 0 0 + 2r = 100 + -18 2r = 100 + -18 Combine like terms: 100 + -18 = 82 2r = 82 Divide each side by '2'. r = 41 Simplifying r = 41
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