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Simplifying r = 0.8(220 + -1y) r = (220 * 0.8 + -1y * 0.8) r = (176 + -0.8y) Solving r = 176 + -0.8y Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Simplifying r = 176 + -0.8y
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