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Simplifying 9r + -9r + 3r + 3 = 15 Reorder the terms: 3 + 9r + -9r + 3r = 15 Combine like terms: 9r + -9r = 0 3 + 0 + 3r = 15 3 + 3r = 15 Solving 3 + 3r = 15 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 3r = 15 + -3 Combine like terms: 3 + -3 = 0 0 + 3r = 15 + -3 3r = 15 + -3 Combine like terms: 15 + -3 = 12 3r = 12 Divide each side by '3'. r = 4 Simplifying r = 4
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