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a)3(x-4)=3x-12
b)5(2+4x)=10+20x
c)2(5a+7b-3)=10a+14b-6
d)-(3r-5t)=-3r+5t
e)-¾(8x+12y)=-6x-9y
f)-(-7a+9b)=7a-9b
g)2,5(-4p-10q)=-10p-25q
h)-½(6a+8)=-3a-4
zad 3 str 14
a)5x+10=5(x+2)
b)3ab+4a=a(3b+4)
c)-3p-5r=-(3p+5r)
d)5a-10ab=5a(1-2b)
e)-6x+4=-2(3x-2)
f)-2xyz-xz=-xz(2y+1)
g)-12a-8=-4(3a+2)
h)3k²-2k=k(3k-2)