3(x-1)³y-(1-x)³z

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3(x-1)³y-(1-x)³z

3(x-1)³y-(1-x)³z
3(x-1)³y-(1-x)³z

3(x-1)³y-(1-x)³z
3(x-1)³y-(1-x)³z
=3(x-1)³y+(x-1)³z
=(x-1)³(3y+z)

3(x-1)³(y+z)