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Simplifying 3(r + -20) + 4r = 2460 Reorder the terms: 3(-20 + r) + 4r = 2460 (-20 * 3 + r * 3) + 4r = 2460 (-60 + 3r) + 4r = 2460 Combine like terms: 3r + 4r = 7r -60 + 7r = 2460 Solving -60 + 7r = 2460 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '60' to each side of the equation. -60 + 60 + 7r = 2460 + 60 Combine like terms: -60 + 60 = 0 0 + 7r = 2460 + 60 7r = 2460 + 60 Combine like terms: 2460 + 60 = 2520 7r = 2520 Divide each side by '7'. r = 360 Simplifying r = 360
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