Помогите 93 очень срочно надо

=(a^2-6a+9)/(a-3)=(a-3)^2/(a-3)=(a-3) =(b^2+10b+25)/(b+5)=(b+5)^2/(b+5)=(b+5) =(c^2-20c+100)*(c-10)=(c-10)^2/(c-10)=(c-10) =(d^2+14d+49)/(d+7)=(d+7)