х^2-4x/x-7=21/x-7
x не равно 7
x^2-4x=21
x^-4x-21=0
x^2+3x-7x-21=0
x(x+3)-7x-21=0
x(x+3)(x-7)=0
x+3=0
x-7=0
x=-3
x=7
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х^2-4x/x-7=21/x-7
x не равно 7
x^2-4x=21
x^-4x-21=0
x^2+3x-7x-21=0
x(x+3)-7x-21=0
x(x+3)(x-7)=0
x+3=0
x-7=0
x=-3
x=7