4a-9=7a=12

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Solution for 4a-9=7a=12 equation: 



4a-9=7a=12

We move all terms to the left:

4a-9-(7a)=0

We add all the numbers together, and all the variables

-3a-9=0

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

-3a=9

a=9/-3

a=-3

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