12=3(n+1)

Solution for 12=3(n+1) equation:

Simplifying
12 = 3(n + 1)

Reorder the terms:
12 = 3(1 + n)
12 = (1 * 3 + n * 3)
12 = (3 + 3n)

Solving
12 = 3 + 3n

Solving for variable 'n'.

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

Add '-3n' to each side of the equation.
12 + -3n = 3 + 3n + -3n

Combine like terms: 3n + -3n = 0
12 + -3n = 3 + 0
12 + -3n = 3

Add '-12' to each side of the equation.
12 + -12 + -3n = 3 + -12

Combine like terms: 12 + -12 = 0
0 + -3n = 3 + -12
-3n = 3 + -12

Combine like terms: 3 + -12 = -9
-3n = -9

Divide each side by '-3'.
n = 3

Simplifying
n = 3