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x-y=8
x=16-y
16-y-y=8
x=16-y
-2y=8-16
-2y=-8/-2
y=4
x=16-4
y=4
x=12
zad 2
x-y=30
x/y=7
x=30+y
30+y/y=7 /*y
30+y=7y
-6y=-30/-6
y=5
x=30+5
y=5
x=35