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Simplifying 5r + 7r = 8r + 12 Combine like terms: 5r + 7r = 12r 12r = 8r + 12 Reorder the terms: 12r = 12 + 8r Solving 12r = 12 + 8r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8r' to each side of the equation. 12r + -8r = 12 + 8r + -8r Combine like terms: 12r + -8r = 4r 4r = 12 + 8r + -8r Combine like terms: 8r + -8r = 0 4r = 12 + 0 4r = 12 Divide each side by '4'. r = 3 Simplifying r = 3
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