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Simplifying r = -2t + 87t + 90 Reorder the terms: r = 90 + -2t + 87t Combine like terms: -2t + 87t = 85t r = 90 + 85t Solving r = 90 + 85t Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Simplifying r = 90 + 85t
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