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Simplifying 3r + 4r + -2 = 12 Reorder the terms: -2 + 3r + 4r = 12 Combine like terms: 3r + 4r = 7r -2 + 7r = 12 Solving -2 + 7r = 12 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + 7r = 12 + 2 Combine like terms: -2 + 2 = 0 0 + 7r = 12 + 2 7r = 12 + 2 Combine like terms: 12 + 2 = 14 7r = 14 Divide each side by '7'. r = 2 Simplifying r = 2
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