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Simplifying 2r + -1(5r + -1r) = 13 + 2r Combine like terms: 5r + -1r = 4r 2r + -1(4r) = 13 + 2r Remove parenthesis around (4r) 2r + -1 * 4r = 13 + 2r Multiply -1 * 4 2r + -4r = 13 + 2r Combine like terms: 2r + -4r = -2r -2r = 13 + 2r Solving -2r = 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. -2r + -2r = 13 + 2r + -2r Combine like terms: -2r + -2r = -4r -4r = 13 + 2r + -2r Combine like terms: 2r + -2r = 0 -4r = 13 + 0 -4r = 13 Divide each side by '-4'. r = -3.25 Simplifying r = -3.25
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