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2x + y = 11
{3x+2y=13
y=11-2x
3x+2(11-2x)=13
3x+22-4x=13
-x+22=13
-x=-9
x=9
Podstawiam pod drugie równanie:
2*9+y=11
18+y=11
18-11=y
y=7
Odpowiedź : x=9 , y=7