1
Solve
() =
=
2
2
Solve
() =
=
2
3
Solve
() =
=
2
4
Solve   x - = x +
x =
2
5
Solve   x - = x +
x =
2
6
Solve   x - = x +
x =
2
7
Solve
( + ) - ( + ) =
=
2
8
Solve
( + ) - ( + ) =
=
2
9
Solve
( + ) - ( + ) =
=
2