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y=2
x=-3+2*2=1
wynik: (x,y)=(1,2)
b) 2(3+y) - (2y-1/4)*do drugiej* + 257/16 = 9 -4y*do drugiej*
y= -13/3
x= 3+(-13/3) = -4/3
wynik: (x,y) = (-4/3,-13/3)