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maka:
i⁷ + 5i⁵ + 6i⁴ + i = i(i²)³ + 5i(i²)² + 6(i²)² + i
= i(-1)² + 5i(-1)² + 6(-1)² + i
= i + 5i + 6 + i
= 7i + 6