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Simplifying 2r + (5 + -1r) = 13 + 2r Remove parenthesis around (5 + -1r) 2r + 5 + -1r = 13 + 2r Reorder the terms: 5 + 2r + -1r = 13 + 2r Combine like terms: 2r + -1r = 1r 5 + 1r = 13 + 2r Solving 5 + 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. 5 + 1r + -2r = 13 + 2r + -2r Combine like terms: 1r + -2r = -1r 5 + -1r = 13 + 2r + -2r Combine like terms: 2r + -2r = 0 5 + -1r = 13 + 0 5 + -1r = 13 Add '-5' to each side of the equation. 5 + -5 + -1r = 13 + -5 Combine like terms: 5 + -5 = 0 0 + -1r = 13 + -5 -1r = 13 + -5 Combine like terms: 13 + -5 = 8 -1r = 8 Divide each side by '-1'. r = -8 Simplifying r = -8
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