5a²b(x-y)³-30ab²(y-x)²

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5a²b(x-y)³-30ab²(y-x)²
5a²b(x-y)³-30ab²(y-x)²

5a²b(x-y)³-30ab²(y-x)²
5a²b(x-y)³-30ab²(y-x)²
=5ab(x-y)²(ax-ay-6b)