(3*5)+(4*-2) = 7
Since 5 is written 8 times just do 5x8 which is 40 and that is your answer.
N+5
Just think, 5 x 7= 35.
5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 + 5 = 55