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{ 4x+y=3y=4
5x-2y=x=y czy to jest dobrze napisane?
{ 4x+y=3y+4
5x-2y=x+y
4x-2y=4 /-1
4x-3y=0
-4x+2y=-4
4x-3y=0
----------
-y=-4 ,y=4
4x-12=0, 4x=12, x=3