7a-8-12a=4

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Solution for 7a-8-12a=4 equation: 



7a-8-12a=4

We move all terms to the left:

7a-8-12a-(4)=0

We add all the numbers together, and all the variables

-5a-12=0

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

-5a=12

a=12/-5

a=-2+2/5

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