4a+5a=39

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Solution for 4a+5a=39 equation: 



4a+5a=39

We move all terms to the left:

4a+5a-(39)=0

We add all the numbers together, and all the variables

9a-39=0

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

9a=39

a=39/9

a=4+1/3

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