X-4/x+1-10/x²-1=4/9 бистро

X-4/x+1-10/x²-1=4/9 (x-4)(x-1)-10/x²-1=4/9 x²-x-4x+4-10/x²-1=4/9 x²-5x-6/x²-1=4/9