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Simplifying 2r + -5(-1r) = 13 + 2r Remove parenthesis around (-1r) 2r + -5 * -1r = 13 + 2r Multiply -5 * -1 2r + 5r = 13 + 2r Combine like terms: 2r + 5r = 7r 7r = 13 + 2r Solving 7r = 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. 7r + -2r = 13 + 2r + -2r Combine like terms: 7r + -2r = 5r 5r = 13 + 2r + -2r Combine like terms: 2r + -2r = 0 5r = 13 + 0 5r = 13 Divide each side by '5'. r = 2.6 Simplifying r = 2.6
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