9a+4a=36

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Solution for 9a+4a=36 equation: 



9a+4a=36

We move all terms to the left:

9a+4a-(36)=0

We add all the numbers together, and all the variables

13a-36=0

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

13a=36

a=36/13

a=2+10/13

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