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Solving Equations Lesson 4 - What to Do - Putting Parts 1 & 2 Together   (page 1 of 3)
---- This prealgebra lesson explains how to solve an equation when you need to add or subtract something from both sides AND multiply and/or divide by something.
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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

Continued on the next page

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