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11\2 = 13\2a +b
-2a+b= -1/*(-1)
6,5a+b=5,5
2a-b=1
6,5a+b=5,5
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2a+6,5a=1+5,5
8,5a=6,5/:8,5
a=13/2 * 2/17
a=13/17
-2a+b=-1
-2*13/17+b=-1
-26/17+b=-1
b=-1+26/17
b=-1+1 9/17
b=9/17
2a-b=1
-13/2a-b=-11/2/*2
2a-b=1/*(-2)
-13a-2b=-11
-4a+2b=-2 teraz wszystko dodajemy
-13a-2b=-11
-17a=-13/:(-17)
a=13/17
Podstawiamy do 2a-b=1 żeby uzyskac b
2*13/17 -b=1
-b=1-26/17
-b=-9/17/*(-1)
a=13/17
b=9/17