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Here's our ammunition:
 

1)We can add or subtract a number from both sides of an equation.
2)We can multiply or divide both sides of an equation by a number.

* And you always do them in this order.

Now, we'll need to do both in the same problem.

Check it out:

Solve    2x - 7 = 3

Remember our goal:  Get the x by himself!

There are two guys bugging the x...  -7 and 2.  The 2 is really locked on and the -7 is, kind of, hanging off...  So, we'll go after him first:

 2x - 7 + 7 = 3 + 7   which gives  2x = 10                            

Now, ditch the 2:

2x / 2 = 10 / 2   which gives   x = 5             

Check it!

2x - 7 = 3 ...  2(5) - 7 = 3 ...  3 = 3

 Yep!