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Simplifying r + (r + 5) = 77 Reorder the terms: r + (5 + r) = 77 Remove parenthesis around (5 + r) r + 5 + r = 77 Reorder the terms: 5 + r + r = 77 Combine like terms: r + r = 2r 5 + 2r = 77 Solving 5 + 2r = 77 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + 2r = 77 + -5 Combine like terms: 5 + -5 = 0 0 + 2r = 77 + -5 2r = 77 + -5 Combine like terms: 77 + -5 = 72 2r = 72 Divide each side by '2'. r = 36 Simplifying r = 36
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