Solving Equations - Cool math Pre-Algebra Help Lessons - How to Deal with Fractions & Decimals

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Coolmath Pre-Algebra
Solving Equations Lesson 6 - Dealing with Fractions & Decimals
(page 3 of 6)
---- This pre-algebra lesson explains how to solve equations that have fractions and decimals in them.

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Solve

We need to ditch the 3 and the 5...
So, multiply both sides by 3x5 = 15...

15 ( (1/5)x + 1/3 ) = 15 (2/5)( x + 4 )

Here's where I don't want you to make the mistake!
Think about it!

(15/5)x + 15/3 = ( (15)(2)/5 )( x + 4 )
No, you do NOT multiply the 15 into this!

3x + 5 = 6 ( x + 4 ) which gives 3x + 5 = 6x + 24 <-be careful here! Ditch the 3x... 3x - 3x + 5 = 6x - 3x + 24 which gives 5 = 3x + 24 ditch the 24... 5 - 24 = 3x + 24 - 24 which gives -19 = 3x ditch the 3... -19/3 = 3x/3 which gives -19/3 = x

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