6=(3-y)

Solution for 6=(3-y) equation:

Simplifying
6 = (3 + -1y)

Remove parenthesis around (3 + -1y)
6 = 3 + -1y

Solving
6 = 3 + -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.
6 + y = 3 + -1y + y

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

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

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

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

Simplifying
y = -3