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Simplifying 2 + -1(5 + -1r) = 13 + 2r 2 + (5 * -1 + -1r * -1) = 13 + 2r 2 + (-5 + 1r) = 13 + 2r Combine like terms: 2 + -5 = -3 -3 + 1r = 13 + 2r Solving -3 + 1r = 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. -3 + 1r + -2r = 13 + 2r + -2r Combine like terms: 1r + -2r = -1r -3 + -1r = 13 + 2r + -2r Combine like terms: 2r + -2r = 0 -3 + -1r = 13 + 0 -3 + -1r = 13 Add '3' to each side of the equation. -3 + 3 + -1r = 13 + 3 Combine like terms: -3 + 3 = 0 0 + -1r = 13 + 3 -1r = 13 + 3 Combine like terms: 13 + 3 = 16 -1r = 16 Divide each side by '-1'. r = -16 Simplifying r = -16
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