usuń nawiasy i wykonaj redukcje wyrazów podobnych
a) (3x-3y)+(-3x+2y)=
b) (z+y+w)+(-z-y+2w)=
c) (2+y-3xz +1 )+(-5xy+3xz-2)=
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a) 3x - 3y - 3x +2y= -y
b) z+y+w-z-y+2w = 3w
c) 2+y-3xz+1-5xy+3xz-2=1+y+5xy