(2x^2-6x)/(x^-9)-(x+3)/(3-x)-(2x+6)/(x^2+6x+9)=92x(x-3)/(x+3)(x-3)+(x+3)/(x-3)-2(x+3)/(x+3)²=92x/(x+3)+(x+3)/(x-3)-2/(x+3)=9两边同乘以(x+3)(x-3)2x(x-3)+(x+3)²-2(x-3)=9(x²-9)2x²-6x+...