90=6(-1+2n)

Solution for 90=6(-1+2n) equation:

Simplifying
90 = 6(-1 + 2n)
90 = (-1 * 6 + 2n * 6)
90 = (-6 + 12n)

Solving
90 = -6 + 12n

Solving for variable 'n'.

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

Add '-12n' to each side of the equation.
90 + -12n = -6 + 12n + -12n

Combine like terms: 12n + -12n = 0
90 + -12n = -6 + 0
90 + -12n = -6

Add '-90' to each side of the equation.
90 + -90 + -12n = -6 + -90

Combine like terms: 90 + -90 = 0
0 + -12n = -6 + -90
-12n = -6 + -90

Combine like terms: -6 + -90 = -96
-12n = -96

Divide each side by '-12'.
n = 8

Simplifying
n = 8