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Simplifying 8r + r = 5r + -12 Combine like terms: 8r + r = 9r 9r = 5r + -12 Reorder the terms: 9r = -12 + 5r Solving 9r = -12 + 5r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5r' to each side of the equation. 9r + -5r = -12 + 5r + -5r Combine like terms: 9r + -5r = 4r 4r = -12 + 5r + -5r Combine like terms: 5r + -5r = 0 4r = -12 + 0 4r = -12 Divide each side by '4'. r = -3 Simplifying r = -3
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