-1+-2y=-2.5y

Solution for -1+-2y=-2.5y equation:

Simplifying
-1 + -2y = -2.5y

Solving
-1 + -2y = -2.5y

Solving for variable 'y'.

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

Add '2.5y' to each side of the equation.
-1 + -2y + 2.5y = -2.5y + 2.5y

Combine like terms: -2y + 2.5y = 0.5y
-1 + 0.5y = -2.5y + 2.5y

Combine like terms: -2.5y + 2.5y = 0.0
-1 + 0.5y = 0.0

Add '1' to each side of the equation.
-1 + 1 + 0.5y = 0.0 + 1

Combine like terms: -1 + 1 = 0
0 + 0.5y = 0.0 + 1
0.5y = 0.0 + 1

Combine like terms: 0.0 + 1 = 1
0.5y = 1

Divide each side by '0.5'.
y = 2

Simplifying
y = 2