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