This is like having two equations.
One is
2x - 3 = 7
and the other is
-(2x - 3) = 7
Which is the same as
-2x + 3 = 7
So now we have to solve both equations.
2x - 3 = 7
2x = 10
x = 5
And
-2x + 3 = 7
-2x = 4
x = -2
So, x = -2,5
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