15=6+2(n-1)

Solution for 15=6+2(n-1) equation:

Simplifying
15 = 6 + 2(n + -1)

Reorder the terms:
15 = 6 + 2(-1 + n)
15 = 6 + (-1 * 2 + n * 2)
15 = 6 + (-2 + 2n)

Combine like terms: 6 + -2 = 4
15 = 4 + 2n

Solving
15 = 4 + 2n

Solving for variable 'n'.

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

Add '-2n' to each side of the equation.
15 + -2n = 4 + 2n + -2n

Combine like terms: 2n + -2n = 0
15 + -2n = 4 + 0
15 + -2n = 4

Add '-15' to each side of the equation.
15 + -15 + -2n = 4 + -15

Combine like terms: 15 + -15 = 0
0 + -2n = 4 + -15
-2n = 4 + -15

Combine like terms: 4 + -15 = -11
-2n = -11

Divide each side by '-2'.
n = 5.5

Simplifying
n = 5.5