Объяснение:
(2a+1)/(a-7)+(a/(a+8)-a/(a-7))*(a+8)/a= (2a+1)/(a-7)+(a(a-7)-a(a+8))/(a+8)(a-7)*(a+8)/a= (2a+1)/(a-7)+(a^2-7a-a^2-8a)/(a-7)*1/a= (2a+1)/(a-7)+(-15a/(a-7))*1/a= (2a+1)/(a-7)-15/(a-7)= (2a+1-15)/(a-7)= (2a-14)/(a-7)= 2(a-7)/(a-7)= 2
