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Oto rozwiązanie:
http://pokazywarka.pl/c3mtaq-2/
Pozdrawiam!
x/x-4 + 4/x = x*x/(x-4)*x + 4*(x-4)/x*(x-4)=
x²/x²-4x+4x-16/x²-4x=
x²+4x-16/x²-4x = x²+4x-16/x(x-4)