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a) 4 x (-1/2)=3 x (-1/2)
-2=-1,5
fałsz
b) -4 x (-1/2) = 2-(1/2-(-1/2))
2=2-(1/2+1/2
0=-1
3zad
a) 4-x=1,3
-x=-2,7
x=2.7
b)2x-6,4=25,6
2x=25,6+6,4
2x=32
x=16
c) 1/2 z + 4 - z = -1
z+8-2z=-2
-z+8=-2
-z=-2-8
z=10
