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x:y=4/3 /*y
x=y+3
x=4/3y
podstawiamy
4/3y=y+3 /*3
x=4/3y
4y=3y +9
x=4/3y
4y-3y=9
x=4/3y
y=9
x=4/3*9
y=9
x=12
pozdrowienia