90=-2(3-6k)

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

Simplifying
90 = -2(3 + -6k)
90 = (3 * -2 + -6k * -2)
90 = (-6 + 12k)

Solving
90 = -6 + 12k

Solving for variable 'k'.

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

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

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

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

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

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

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

Simplifying
k = 8