15=-3(2n-1)

Solution for 15=-3(2n-1) equation:

Simplifying
15 = -3(2n + -1)

Reorder the terms:
15 = -3(-1 + 2n)
15 = (-1 * -3 + 2n * -3)
15 = (3 + -6n)

Solving
15 = 3 + -6n

Solving for variable 'n'.

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

Add '6n' to each side of the equation.
15 + 6n = 3 + -6n + 6n

Combine like terms: -6n + 6n = 0
15 + 6n = 3 + 0
15 + 6n = 3

Add '-15' to each side of the equation.
15 + -15 + 6n = 3 + -15

Combine like terms: 15 + -15 = 0
0 + 6n = 3 + -15
6n = 3 + -15

Combine like terms: 3 + -15 = -12
6n = -12

Divide each side by '6'.
n = -2

Simplifying
n = -2