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Simplifying r(x) = 270x + -90x Multiply r * x rx = 270x + -90x Combine like terms: 270x + -90x = 180x rx = 180x Solving rx = 180x Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Divide each side by 'x'. r = 180 Simplifying r = 180

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