3=-[-y+6]

Solution for 3=-[-y+6] equation:

Simplifying
3 = -1[-1y + 6]

Reorder the terms:
3 = -1[6 + -1y]
3 = [6 * -1 + -1y * -1]
3 = [-6 + 1y]

Solving
3 = -6 + 1y

Solving for variable 'y'.

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

Add '-1y' to each side of the equation.
3 + -1y = -6 + 1y + -1y

Combine like terms: 1y + -1y = 0
3 + -1y = -6 + 0
3 + -1y = -6

Add '-3' to each side of the equation.
3 + -3 + -1y = -6 + -3

Combine like terms: 3 + -3 = 0
0 + -1y = -6 + -3
-1y = -6 + -3

Combine like terms: -6 + -3 = -9
-1y = -9

Divide each side by '-1'.
y = 9

Simplifying
y = 9