I need to find out the missing variable.
10 x n - 55 = 155
n=
10n - 55 = 155
Add 55 to both sides of the equation.
10n = 210
Divide by 10
n = 21
10 x n - 55 = 155
n=
Add 55 to both sides of the equation.
10n = 210
Divide by 10
n = 21