3=[-y+6]

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

Simplifying
3 = [-1y + 6]

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

Remove brackets around [6 + -1y]
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 'y' to each side of the equation.
3 + y = 6 + -1y + y

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

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

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

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

Simplifying
y = 3