Помогите,очень срочно!!!!!!!!!!

Решите задачу:

$\frac{5}{x^2-10x}-\frac{x-20}{x^2+10x}-\frac{10}{x^2-100}=0\\\\\frac{5}{x(x-10)}-\frac{x-20}{x(x+10)}-\frac{10}{(x-10)(x+10)}=0\\\\\frac{5x+50-(x-20)(x-10)-10x}{x(x-10)(x+10)}=0\; ,\; \; \frac{5x+50-x^2+30x-200-10x}{x(x-10)(x+10)}=0\\\\\frac{-x^2+25x-150}{x(x-10)(x+10)}=0\; ,\; \; ODZ:\; \; x\ne 0,\; x\ne -10,\; x\ne 10\\\\x^2-25x+150=0\; ,\; \; D=25\\\\x_1=\frac{25-5}{2}=10\; ,\; \; x_2=\frac{25+5}{2}=15$