y+y-(y-1-1)=-1-1(-y)

Solution for y+y-(y-1-1)=-1-1(-y) equation:

Simplifying
y + y + -1(y + -1 + -1) = -1 + -1(-1y)

Reorder the terms:
y + y + -1(-1 + -1 + y) = -1 + -1(-1y)

Combine like terms: -1 + -1 = -2
y + y + -1(-2 + y) = -1 + -1(-1y)
y + y + (-2 * -1 + y * -1) = -1 + -1(-1y)
y + y + (2 + -1y) = -1 + -1(-1y)

Reorder the terms:
2 + y + y + -1y = -1 + -1(-1y)

Combine like terms: y + y = 2y
2 + 2y + -1y = -1 + -1(-1y)

Combine like terms: 2y + -1y = 1y
2 + 1y = -1 + -1(-1y)

Remove parenthesis around (-1y)
2 + 1y = -1 + -1 * -1y

Multiply -1 * -1
2 + 1y = -1 + 1y

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

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

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

Solving
2 = -1

Couldn't find a variable to solve for.

This equation is invalid, the left and right sides are not equal, therefore there is no solution.