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Simplifying 7r + 3 + -3r = 15 Reorder the terms: 3 + 7r + -3r = 15 Combine like terms: 7r + -3r = 4r 3 + 4r = 15 Solving 3 + 4r = 15 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 4r = 15 + -3 Combine like terms: 3 + -3 = 0 0 + 4r = 15 + -3 4r = 15 + -3 Combine like terms: 15 + -3 = 12 4r = 12 Divide each side by '4'. r = 3 Simplifying r = 3
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