3/7a-9=12

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Solution for 3/7a-9=12 equation: 



3/7a-9=12

We move all terms to the left:

3/7a-9-(12)=0



Domain of the equation: 7a!=0

a!=0/7

a!=0

a∈R



We add all the numbers together, and all the variables

3/7a-21=0

We multiply all the terms by the denominator


-21*7a+3=0

Wy multiply elements

-147a+3=0

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

-147a=-3

a=-3/-147

a=1/49

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