Ответ:

x=4

Объяснение:

x-2/x+3+x-2/x-1=20/(x+3)(x-1); x≠-3; x≠1;

x-2/x+3+x-2/x-1-20/(x+3)(x-1)=0

((x-1)*(x-2)+(x+3)*(x-2)-20)/((x+3)*(x-1))=0

(x²-2x-x+2+x²-2x+3x-6-20)/((x+3)(x-1))=0

(2x²-2x-24)/((x+3)(x-1))=0

(2(x+3(x-4))/((x+3)(x-1))=0

(2(x-4))/(x-1)=0

2(x-4)=0

x-4=0

x=4