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b)(x+y)(z-1)
c)(x - 1)(2-a)
d)(x-1)(3y-x)
e)b²(1+b)(1-b)
f)-x · (x-5)²
g)(a+9)²
h)z²(2z+3)(2z-3)
i)(z-1)(3z-4)
j)a(a-2)²