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Simplifying 7 + 3r + 2r = 12 Combine like terms: 3r + 2r = 5r 7 + 5r = 12 Solving 7 + 5r = 12 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 5r = 12 + -7 Combine like terms: 7 + -7 = 0 0 + 5r = 12 + -7 5r = 12 + -7 Combine like terms: 12 + -7 = 5 5r = 5 Divide each side by '5'. r = 1 Simplifying r = 1
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