Помогите мне этот номерр 104

а/(b-2)   + 3/(2-b) = a/(b-2)  +   3/ -(b-2) = a/(b-2) -  3/(b-2) = (a-3)/(b-2) (x+3)/(x-1) +  x/(1-x) =  (x+3)/(x-1)  - x/(x-1) = (x+3-x)/(x-1) = 3/(x-1) 3p/(p-q)  + 3q/(q-p) = 3p/(p-q)  - 3q/(p-q) = (3p-3q)/(p-q) =  = 3(p-q)  / (p-q) = 3/1  =3 7m/(2n-m)   +   14n/(m-2n) =  7m/(2n-m)   - 14n/(2n-m) =  =  (7m - 14n) / (2n-m)  =   ( -7(2n - m) ) / (2n-m) =  -7/1 =  - 7