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