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Simplifying 3 = 12 + -1r + 8 Reorder the terms: 3 = 12 + 8 + -1r Combine like terms: 12 + 8 = 20 3 = 20 + -1r Solving 3 = 20 + -1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add 'r' to each side of the equation. 3 + r = 20 + -1r + r Combine like terms: -1r + r = 0 3 + r = 20 + 0 3 + r = 20 Add '-3' to each side of the equation. 3 + -3 + r = 20 + -3 Combine like terms: 3 + -3 = 0 0 + r = 20 + -3 r = 20 + -3 Combine like terms: 20 + -3 = 17 r = 17 Simplifying r = 17
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