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Simplifying R = x(40 + -0.4x) R = (40 * x + -0.4x * x) R = (40x + -0.4x2) Solving R = 40x + -0.4x2 Solving for variable 'R'. Move all terms containing R to the left, all other terms to the right. Simplifying R = 40x + -0.4x2
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