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Simplifying r = -0.1x2 + 13x + 900 Reorder the terms: r = 900 + 13x + -0.1x2 Solving r = 900 + 13x + -0.1x2 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Simplifying r = 900 + 13x + -0.1x2
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