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Simplifying 3(r + -140) + 3r = 2580 Reorder the terms: 3(-140 + r) + 3r = 2580 (-140 * 3 + r * 3) + 3r = 2580 (-420 + 3r) + 3r = 2580 Combine like terms: 3r + 3r = 6r -420 + 6r = 2580 Solving -420 + 6r = 2580 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '420' to each side of the equation. -420 + 420 + 6r = 2580 + 420 Combine like terms: -420 + 420 = 0 0 + 6r = 2580 + 420 6r = 2580 + 420 Combine like terms: 2580 + 420 = 3000 6r = 3000 Divide each side by '6'. r = 500 Simplifying r = 500
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