108=3(1+7n)

Solution for 108=3(1+7n) equation:

Simplifying
108 = 3(1 + 7n)
108 = (1 * 3 + 7n * 3)
108 = (3 + 21n)

Solving
108 = 3 + 21n

Solving for variable 'n'.

Move all terms containing n to the left, all other terms to the right.

Add '-21n' to each side of the equation.
108 + -21n = 3 + 21n + -21n

Combine like terms: 21n + -21n = 0
108 + -21n = 3 + 0
108 + -21n = 3

Add '-108' to each side of the equation.
108 + -108 + -21n = 3 + -108

Combine like terms: 108 + -108 = 0
0 + -21n = 3 + -108
-21n = 3 + -108

Combine like terms: 3 + -108 = -105
-21n = -105

Divide each side by '-21'.
n = 5

Simplifying
n = 5