7a-2=9a+4=7a+12

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Solution for 7a-2=9a+4=7a+12 equation: 



7a-2=9a+4=7a+12

We move all terms to the left:

7a-2-(9a+4)=0

We get rid of parentheses

7a-9a-4-2=0

We add all the numbers together, and all the variables

-2a-6=0

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

-2a=6

a=6/-2

a=-3

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