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Simplifying 2(r + -1) = 9 + r Reorder the terms: 2(-1 + r) = 9 + r (-1 * 2 + r * 2) = 9 + r (-2 + 2r) = 9 + r Solving -2 + 2r = 9 + 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. -2 + 2r + -1r = 9 + r + -1r Combine like terms: 2r + -1r = 1r -2 + 1r = 9 + r + -1r Combine like terms: r + -1r = 0 -2 + 1r = 9 + 0 -2 + 1r = 9 Add '2' to each side of the equation. -2 + 2 + 1r = 9 + 2 Combine like terms: -2 + 2 = 0 0 + 1r = 9 + 2 1r = 9 + 2 Combine like terms: 9 + 2 = 11 1r = 11 Divide each side by '1'. r = 11 Simplifying r = 11
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