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Simplifying r(x) = -0.5x2 + 800 + -100 Multiply r * x rx = -0.5x2 + 800 + -100 Reorder the terms: rx = 800 + -100 + -0.5x2 Combine like terms: 800 + -100 = 700 rx = 700 + -0.5x2 Solving rx = 700 + -0.5x2 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Divide each side by 'x'. r = 700x-1 + -0.5x Simplifying r = 700x-1 + -0.5x
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