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2y+y=17-15
3y=2
y=2/3
SPRAWDZENIE:
15+2*2/3=17-2/3
16 1/3=16 1/3
P.S. 2/3 to nie dwa podzielone przez 3, tylko dwie trzecie
2y+y = 17-15
3y = 2 |:3
y = 2/3