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2x+y=4
-2x-6y= -14
2x+y=4 dodajemy stronami
-5y= -10/:(-5)
y=2
x=7-3y
x=7-6
x=1
x=1
y=2
2x+y=4
2(7-3y)+y=4
14-6y+y=4
-5y=4-14
-5y=-10
y = 2
x=7-3*2=1