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Simplifying 12 = 9r + 3 Reorder the terms: 12 = 3 + 9r Solving 12 = 3 + 9r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9r' to each side of the equation. 12 + -9r = 3 + 9r + -9r Combine like terms: 9r + -9r = 0 12 + -9r = 3 + 0 12 + -9r = 3 Add '-12' to each side of the equation. 12 + -12 + -9r = 3 + -12 Combine like terms: 12 + -12 = 0 0 + -9r = 3 + -12 -9r = 3 + -12 Combine like terms: 3 + -12 = -9 -9r = -9 Divide each side by '-9'. r = 1 Simplifying r = 1
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