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Simplifying r4 + -4r3 + 13r2 + -36r + 36 = 0 Reorder the terms: 36 + -36r + 13r2 + -4r3 + r4 = 0 Solving 36 + -36r + 13r2 + -4r3 + r4 = 0 Solving for variable 'r'. The solution to this equation could not be determined.
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