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Simplifying 12r + 13 = 85 Reorder the terms: 13 + 12r = 85 Solving 13 + 12r = 85 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + 12r = 85 + -13 Combine like terms: 13 + -13 = 0 0 + 12r = 85 + -13 12r = 85 + -13 Combine like terms: 85 + -13 = 72 12r = 72 Divide each side by '12'. r = 6 Simplifying r = 6
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