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Simplifying 2r + -1(5r + -1r) = 13 Combine like terms: 5r + -1r = 4r 2r + -1(4r) = 13 Remove parenthesis around (4r) 2r + -1 * 4r = 13 Multiply -1 * 4 2r + -4r = 13 Combine like terms: 2r + -4r = -2r -2r = 13 Solving -2r = 13 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Divide each side by '-2'. r = -6.5 Simplifying r = -6.5
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