1+(-1)+y-(-2)=3+y+1+(-y)

Solution for 1+(-1)+y-(-2)=3+y+1+(-y) equation:

1+(-1)+y-(-2)=3+y+1+(-y)

We simplify the equation to the form, which is simple to understand 
1+(-1)+y-(-2)=3+y+1+(-y)

Remove unnecessary parentheses
+1-1+y-(-2+)=+3+y+1+(-y+)

Remove unnecessary parentheses
1-1+y+2=3+y+1+(-y)

Remove unnecessary parentheses
+1-1+y+2=+3+y+1-y

We move all terms containing y to the left and all other terms to the right. 
+1y-1y+1y=+3+1-1+1-2

We simplify left and right side of the equation. 
+1y=+2

We divide both sides of the equation by 1 to get y. 
y=2