4a+9a=8

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Solution for 4a+9a=8 equation: 



4a+9a=8

We move all terms to the left:

4a+9a-(8)=0

We add all the numbers together, and all the variables

13a-8=0

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

13a=8

a=8/13

a=8/13

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