rozwiąż w pamięci równania:
x+8=20 x=__
y-16=50 y=__
70-z=69 z=__
15+c=15 c=__
2a=-16 a=__
k:7=14 k=__
24:u=6 u=__
-5v=-50 v=__
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x+8=20 x=12
y-16=50 y=66
70-z=69 z=1
15+c=15 c=0
2a=-16 a=-8
k:7=14 k=98
24:u=6 u=144
-5v=-50 v=10
x=12
y=66
z=1
c=0
a=-4
k= 98
u=4
v=10