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Simplifying 2r + -1(5r) = 13 + 2r Remove parenthesis around (5r) 2r + -1 * 5r = 13 + 2r Multiply -1 * 5 2r + -5r = 13 + 2r Combine like terms: 2r + -5r = -3r -3r = 13 + 2r Solving -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. -3r + -2r = 13 + 2r + -2r Combine like terms: -3r + -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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