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a)3x-4(y-3x)
3x-4y+12x
3x+12x-4y
15x-4y
b)8(-12x+y)=12x
-96x+8y=12x
-84x+8y
c)3(a-3b)-4(2b-4x)
3a-9ab-8b-4x
d)-5(4a-3b)-4(5a-5b)
-20a+15b-20a+20b
-40a+35b
e)-2x(y-5y-3)=3x(x+5y+2)
-2xy+10y+6y=3x(do kwadratu) +15xy+5y
13xy+15y=3x(do kwadraty)
f)-3x(2x-3y)+2x(-3x-5y-1)
-6x(do kwadratu) +9xy-6x(do kwadratu)-10xy-2x
xy-8x