-1=2xy

Solution for -1=2xy equation:

Simplifying
-1 = 2xy

Solving
-1 = 2xy

Solving for variable 'x'.

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

Add '-2xy' to each side of the equation.
-1 + -2xy = 2xy + -2xy

Combine like terms: 2xy + -2xy = 0
-1 + -2xy = 0

Add '1' to each side of the equation.
-1 + 1 + -2xy = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -2xy = 0 + 1
-2xy = 0 + 1

Combine like terms: 0 + 1 = 1
-2xy = 1

Divide each side by '-2y'.
x = -0.5y-1

Simplifying
x = -0.5y-1