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5/2x-1/4y=x+y |*4
100x+y=85x+8 1/2y |-85x
10x-y=x+y
15x-7 1/2y=0 |*2
9x-2y=0
30x-15y=0 |:(-15)
-2x+2y=0
9x-2y=0
----------------------------
7x=0
x=0
y=0
Nie wiem czy to dobrze wyszło....