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Coolmath Pre-Algebra
Solving Equations Lesson 3 - What to Do - Part 2   (page 3 of 5)
---- This pre-algebra lesson explains how to solve an equation by multiplying or dividing both sides of an equation by a number.

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Here's another one:
 
Solve        (1/4)x = 9

There are a couple different ways to deal with this one:

WAY 1:

Rewrite it like this:

(1/4)x = 9
Since the
4 is dividing into the x,
we'll multiply both sides by
4 to undo him:

4 * (1/4)x = 9 * 4   which gives   (4/4)x = 9*4   which gives   x = 36

WAY 2:

Use the fraction fact that 4 is the multiplicative inverse (big word time!) of 1/4:

4 * (1/4)x = 9 * 4  which gives   x = 36

Remember:

4 * (1/4) = (4/1) * (1/4) = 4/4

Continued on the next page

 The printing and distribution and/or downloading of these lessons is strictly prohibited.

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