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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

Approved by eNotes Editorial Team

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