90=-2(3+6n)

Solution for 90=-2(3+6n) equation:

Simplifying
90 = -2(3 + 6n)
90 = (3 * -2 + 6n * -2)
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