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y- druga liczba
x/y=3
x+y=(x-y)+6
x=3y
3y+y=3y-y+6
x=3y
4y=2y+6
x=3y
4y-2y=6
x=3y
2y=6/:2
x=3y
y=3
x=3•3
y=3
x=9
y=3