7.0-2a=9

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Solution for 7.0-2a=9 equation: 



7.0-2a=9

We move all terms to the left:

7.0-2a-(9)=0

We add all the numbers together, and all the variables

-2a-2=0

We move all terms containing a to the left, all other terms to the right

-2a=2

a=2/-2

a=-1

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