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y-druga liczba
x+y=13
3x+2y=33
x=13-y
3*(13-y)+2y=33
x=13-y
39-3y+2y=33
x=13-y
-y=33-39
x=13-y
-y=-6/*(-1)
x=13-y
y=6
x=13-6
y=6
x=7
y=6