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Simplifying 2r + 3(r + 3) + 3r = 1 Reorder the terms: 2r + 3(3 + r) + 3r = 1 2r + (3 * 3 + r * 3) + 3r = 1 2r + (9 + 3r) + 3r = 1 Reorder the terms: 9 + 2r + 3r + 3r = 1 Combine like terms: 2r + 3r = 5r 9 + 5r + 3r = 1 Combine like terms: 5r + 3r = 8r 9 + 8r = 1 Solving 9 + 8r = 1 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 8r = 1 + -9 Combine like terms: 9 + -9 = 0 0 + 8r = 1 + -9 8r = 1 + -9 Combine like terms: 1 + -9 = -8 8r = -8 Divide each side by '8'. r = -1 Simplifying r = -1
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