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Simplifying -2r + -1(5 + -1r) = 13 + r -2r + (5 * -1 + -1r * -1) = 13 + r -2r + (-5 + 1r) = 13 + r Reorder the terms: -5 + -2r + 1r = 13 + r Combine like terms: -2r + 1r = -1r -5 + -1r = 13 + r Solving -5 + -1r = 13 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. -5 + -1r + -1r = 13 + r + -1r Combine like terms: -1r + -1r = -2r -5 + -2r = 13 + r + -1r Combine like terms: r + -1r = 0 -5 + -2r = 13 + 0 -5 + -2r = 13 Add '5' to each side of the equation. -5 + 5 + -2r = 13 + 5 Combine like terms: -5 + 5 = 0 0 + -2r = 13 + 5 -2r = 13 + 5 Combine like terms: 13 + 5 = 18 -2r = 18 Divide each side by '-2'. r = -9 Simplifying r = -9
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