Выражения (4/x^2-6x+9 – x+3/4x-12)* x-3/5-х+2/3-х

1)4/(x-3)²-(x+3)/4(x-3)=(16-x²+9)/4(x-3)²=(25-x²)/4(x-3)²
2)(5-x)(5+x)/4(x-3)²*(x-3)/(5-x)=(5+x)/4(x-3)
3)(5+x)/4(x-3)-2/(x-3)=(5+x-8)/4(x-3)=(x-3)/4(x-3)=1/4