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Simplifying r + (8 + r) = 100 Remove parenthesis around (8 + r) r + 8 + r = 100 Reorder the terms: 8 + r + r = 100 Combine like terms: r + r = 2r 8 + 2r = 100 Solving 8 + 2r = 100 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + 2r = 100 + -8 Combine like terms: 8 + -8 = 0 0 + 2r = 100 + -8 2r = 100 + -8 Combine like terms: 100 + -8 = 92 2r = 92 Divide each side by '2'. r = 46 Simplifying r = 46
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