3-y=y+4

Solution for 3-y=y+4 equation:

Simplifying
3 + -1y = y + 4

Reorder the terms:
3 + -1y = 4 + y

Solving
3 + -1y = 4 + y

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 + -1y = 4 + y + -1y

Combine like terms: -1y + -1y = -2y
3 + -2y = 4 + y + -1y

Combine like terms: y + -1y = 0
3 + -2y = 4 + 0
3 + -2y = 4

Add '-3' to each side of the equation.
3 + -3 + -2y = 4 + -3

Combine like terms: 3 + -3 = 0
0 + -2y = 4 + -3
-2y = 4 + -3

Combine like terms: 4 + -3 = 1
-2y = 1

Divide each side by '-2'.
y = -0.5

Simplifying
y = -0.5