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Simplifying 2r + 9 + 3 = 18 Reorder the terms: 9 + 3 + 2r = 18 Combine like terms: 9 + 3 = 12 12 + 2r = 18 Solving 12 + 2r = 18 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 2r = 18 + -12 Combine like terms: 12 + -12 = 0 0 + 2r = 18 + -12 2r = 18 + -12 Combine like terms: 18 + -12 = 6 2r = 6 Divide each side by '2'. r = 3 Simplifying r = 3
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