20-09-2017
Mathematics

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6a+3a-4a=21 (please solve)

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20-09-2017

remember, you can do anything to an equation as long as you do it to both sides

6a+3a-4a=21
add like terms
6+3=9, and 9-4=5
5a=21
divide both sides by 5
[tex]a=\frac{21}{5}[/tex]

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