(1) 6-(x+5)/[(7x-5)(x+4)]=[6(7x-5)(x+4)-(x+5)]/[(7x-5)(x+4)]=
[6(7x2+23x-20)-x-5]/[(7x-5)(x+4)]=
(42x2+138x-120-x-5)/[(7x-5)(x+4)]=
(42x2+137x-125)/[(7x-5)(x+4)];
or
(2) (6-x)+5/[(7x-5)(x+4)]=
(6-x)(7x-5)(x+4)+5/[(7x-5)(x+4)]=
[(6-x)(7x2+23x-20)+5]/[(7x-5)(x+4)]=
(42x2+138x-120-7x3-23x2+20x+5)/[(7x-5)(x+4)]=
(-7x3+19x2+158x-115)/[(7x-5)(x+4)].