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Simplifying (2r + -5) = 81 Reorder the terms: (-5 + 2r) = 81 Remove parenthesis around (-5 + 2r) -5 + 2r = 81 Solving -5 + 2r = 81 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 = 81 + 5 Combine like terms: -5 + 5 = 0 0 + 2r = 81 + 5 2r = 81 + 5 Combine like terms: 81 + 5 = 86 2r = 86 Divide each side by '2'. r = 43 Simplifying r = 43
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