factorize x(y – z)² – a(z - y)³
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x ( y - z ) ² - a ( z - y ) ³
=x ( y - z ) ² - a (-1)³ ( y - z ) ³
=x ( y - z ) ² + a ( y - z ) ³
=( y - z ) ² ( x + a ( y - z ) )
=( y - z ) ² (x + ay - az )
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