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Simplifying 5(r + -90) + 5r = 4050 Reorder the terms: 5(-90 + r) + 5r = 4050 (-90 * 5 + r * 5) + 5r = 4050 (-450 + 5r) + 5r = 4050 Combine like terms: 5r + 5r = 10r -450 + 10r = 4050 Solving -450 + 10r = 4050 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '450' to each side of the equation. -450 + 450 + 10r = 4050 + 450 Combine like terms: -450 + 450 = 0 0 + 10r = 4050 + 450 10r = 4050 + 450 Combine like terms: 4050 + 450 = 4500 10r = 4500 Divide each side by '10'. r = 450 Simplifying r = 450
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