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y-mianownik ułamka
/kreska ułamkowa
x+1/y+1=4/5
x-2/y+2=5/11
5x+5=4y+4
11x-22=5y+10
5x-4y=-1 |*(-5)
11x-5y=32 |*4
-25x+20y=5
44x-20y=128
-------------
19x=133
x=7
y=9
ten ułamek to 7/9
pozdrawiam:)