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A.
2.5*2-2/3*(-3)=5+2=7
2(2-3)=2*(-1)=-2
Uklad rownan jest spelniony.
Odp. A.
II sposob:
2,5x-2/3y=7 /*6
2(x+y)=-2 /*2
15x-4y=42
4x + 4x=-4
------------- +
19x=38
x=2
2+y=-1
y=-3