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Simplifying 2(r + 2) + -1r = -2 + 9 Reorder the terms: 2(2 + r) + -1r = -2 + 9 (2 * 2 + r * 2) + -1r = -2 + 9 (4 + 2r) + -1r = -2 + 9 Combine like terms: 2r + -1r = 1r 4 + 1r = -2 + 9 Combine like terms: -2 + 9 = 7 4 + 1r = 7 Solving 4 + 1r = 7 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 1r = 7 + -4 Combine like terms: 4 + -4 = 0 0 + 1r = 7 + -4 1r = 7 + -4 Combine like terms: 7 + -4 = 3 1r = 3 Divide each side by '1'. r = 3 Simplifying r = 3
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