4a+9a=42

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Solution for 4a+9a=42 equation: 



4a+9a=42

We move all terms to the left:

4a+9a-(42)=0

We add all the numbers together, and all the variables

13a-42=0

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

13a=42

a=42/13

a=3+3/13

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