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Simplifying 4(r + -50) + 4r = 2580 Reorder the terms: 4(-50 + r) + 4r = 2580 (-50 * 4 + r * 4) + 4r = 2580 (-200 + 4r) + 4r = 2580 Combine like terms: 4r + 4r = 8r -200 + 8r = 2580 Solving -200 + 8r = 2580 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '200' to each side of the equation. -200 + 200 + 8r = 2580 + 200 Combine like terms: -200 + 200 = 0 0 + 8r = 2580 + 200 8r = 2580 + 200 Combine like terms: 2580 + 200 = 2780 8r = 2780 Divide each side by '8'. r = 347.5 Simplifying r = 347.5
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