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Simplifying 2r + -1(5 + -1r) = 13 + -2r 2r + (5 * -1 + -1r * -1) = 13 + -2r 2r + (-5 + 1r) = 13 + -2r Reorder the terms: -5 + 2r + 1r = 13 + -2r Combine like terms: 2r + 1r = 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 = 5r -5 + 5r = 13 + -2r + 2r Combine like terms: -2r + 2r = 0 -5 + 5r = 13 + 0 -5 + 5r = 13 Add '5' to each side of the equation. -5 + 5 + 5r = 13 + 5 Combine like terms: -5 + 5 = 0 0 + 5r = 13 + 5 5r = 13 + 5 Combine like terms: 13 + 5 = 18 5r = 18 Divide each side by '5'. r = 3.6 Simplifying r = 3.6
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