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y-czekolada drozsza
2x+3y=13
y=1,5x
2x+3y=13
y-1,5x=0 /*(-3)
2x+3y=13
-3y+4,5x=0
gore i dol dodajemy
6,5x=13 /:6,5
x=2
2x+3y=13 2*2+3y=13 3y=13-4 3y=9 /:3 y=3
x=2
y=3