-1=3+y

Solution for -1=3+y equation:

Simplifying
-1 = 3 + y

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

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

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

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

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

Divide each side by '-1'.
y = -4

Simplifying
y = -4