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y=x+2 -mianownik
x/y - szukany ułamek
x+y=8
y=x+2
x+x+2=8
y=x+2
2x+2=8
y=x+2
2x=6
y=x+2
x=3
y=3+2
x=3
y=5
Ten ułamek to 3/5.