factorize the expression a³x+a²(x-y) -a (y+z)-z
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a³x + a² (x - y) - a (y + z) - z
= a³x + a²x - a²y - ay - az - z
= a²x (a + 1) - ay (a + 1) + z (a + 1)
= (a + 1) (a²x - ay + z),
which is the required factorization.
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