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Simplifying 12 = 3 + 3r Solving 12 = 3 + 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. 12 + -3r = 3 + 3r + -3r Combine like terms: 3r + -3r = 0 12 + -3r = 3 + 0 12 + -3r = 3 Add '-12' to each side of the equation. 12 + -12 + -3r = 3 + -12 Combine like terms: 12 + -12 = 0 0 + -3r = 3 + -12 -3r = 3 + -12 Combine like terms: 3 + -12 = -9 -3r = -9 Divide each side by '-3'. r = 3 Simplifying r = 3
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