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Simplifying r4 + r3 + -7r2 + -1r + 6 = 0 Reorder the terms: 6 + -1r + -7r2 + r3 + r4 = 0 Solving 6 + -1r + -7r2 + r3 + r4 = 0 Solving for variable 'r'. The solution to this equation could not be determined.
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