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Simplifying 3 + 2(r + 2) = 9 + r Reorder the terms: 3 + 2(2 + r) = 9 + r 3 + (2 * 2 + r * 2) = 9 + r 3 + (4 + 2r) = 9 + r Combine like terms: 3 + 4 = 7 7 + 2r = 9 + r Solving 7 + 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. 7 + 2r + -1r = 9 + r + -1r Combine like terms: 2r + -1r = 1r 7 + 1r = 9 + r + -1r Combine like terms: r + -1r = 0 7 + 1r = 9 + 0 7 + 1r = 9 Add '-7' to each side of the equation. 7 + -7 + 1r = 9 + -7 Combine like terms: 7 + -7 = 0 0 + 1r = 9 + -7 1r = 9 + -7 Combine like terms: 9 + -7 = 2 1r = 2 Divide each side by '1'. r = 2 Simplifying r = 2
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