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Simplifying 7r + 12 + -5r = 15 Reorder the terms: 12 + 7r + -5r = 15 Combine like terms: 7r + -5r = 2r 12 + 2r = 15 Solving 12 + 2r = 15 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 2r = 15 + -12 Combine like terms: 12 + -12 = 0 0 + 2r = 15 + -12 2r = 15 + -12 Combine like terms: 15 + -12 = 3 2r = 3 Divide each side by '2'. r = 1.5 Simplifying r = 1.5
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