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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 = 3r -5 + 3r = 13 + r Solving -5 + 3r = 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 + 3r + -1r = 13 + r + -1r Combine like terms: 3r + -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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