х²+zx+z+x
zx+z = z*(x+1)
x²+x = x(x+1)
x²+zx+z+x = (x+1)(z+x)
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х²+zx+z+x
zx+z = z*(x+1)
x²+x = x(x+1)
x²+zx+z+x = (x+1)(z+x)