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b)0,6(6x-2y-1)
c)1/7(-6x+5y+1)
d)5(x2-2x-5)
e)0,5x(-9y-x+3y)
f)1/9(4a2+2b2-1)
g)9yz(-3x+6a-4v+1)
h)3/5a3bc-2/5a2c+0,2a2b ---> 1/5a2(3abc-2c+1b)
i)0,25(-x2y-2x+6y3)
j)2a(-4a4-a2-2-a+3a3)