Question 215614
990/N=45,,,,,,multiply  both  sides  by  N
.
(990/N)*N = 45 * N
.
990  =  45*N,,,,,,now  divide  both sides  by 45
.
990/45 = (45*N) /45,,,,,,simplify
.
22 = N
.
.
check,,,,990/22 = 45,,,,,ok
.