10/(7 x), 2/(x + 1)
LCD = LCM (7 x, x+1)
(7 x, x+1) -> divide with 7 -> (x , x +1)
(x, x+1) -> divide with x-> (1 , x +1)
(1, x+1) -> divide with x + 1 -> (1 , 1)
LCD = LCM (7 x, x+1) = 7*x*(x+1) = 7x(x+1)
10/(7 x), 2/(x + 1) = (10(x+1))/(7x(x+1), (2*7x)/((x + 1)*7 x)
= (10x+10)/(7x(x+1), (14x)/((x + 1)*7 x)