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Simplifying 2r + (-5 + r) = 13 + 2r Remove parenthesis around (-5 + r) 2r + -5 + r = 13 + 2r Reorder the terms: -5 + 2r + r = 13 + 2r Combine like terms: 2r + r = 3r -5 + 3r = 13 + 2r Solving -5 + 3r = 13 + 2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2r' to each side of the equation. -5 + 3r + -2r = 13 + 2r + -2r Combine like terms: 3r + -2r = 1r -5 + 1r = 13 + 2r + -2r Combine like terms: 2r + -2r = 0 -5 + 1r = 13 + 0 -5 + 1r = 13 Add '5' to each side of the equation. -5 + 5 + 1r = 13 + 5 Combine like terms: -5 + 5 = 0 0 + 1r = 13 + 5 1r = 13 + 5 Combine like terms: 13 + 5 = 18 1r = 18 Divide each side by '1'. r = 18 Simplifying r = 18
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