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Simplifying r(4 + -1) + 9 = 12 Combine like terms: 4 + -1 = 3 r(3) + 9 = 12 Reorder the terms for easier multiplication: 3r + 9 = 12 Reorder the terms: 9 + 3r = 12 Solving 9 + 3r = 12 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 + 3r = 12 + -9 Combine like terms: 9 + -9 = 0 0 + 3r = 12 + -9 3r = 12 + -9 Combine like terms: 12 + -9 = 3 3r = 3 Divide each side by '3'. r = 1 Simplifying r = 1
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