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7+5=12 12-5=7
40-13=27 27+13=40
12*6=72 72:6=12
99:3=33 33*3=99
zad.2
x+8=20 y-16=50 70-z=69 15+c=15
x=12 y=66 z=1 c=0
2a=-16 k:3=33 24:u=6 -5v=-50
a=-8 k=99 u=4 v=10
zad3.
v=1 x=10 y=0 w=0
zad.4
a).2x+5=7 x=1
b).2-4x=6 x=-1
c).x-7=-9 x=-2
d).3(x-2)=9 x=5
zad.5
2x+8
6u=0
3v=4v
(2 ijedna szósta+cztery siódme)w=0