-3a/a+15=9/a-21

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Solution for -3a/a+15=9/a-21 equation: 



-3a/a+15=9/a-21

We move all terms to the left:

-3a/a+15-(9/a-21)=0



Domain of the equation: a!=0

a∈R





Domain of the equation: a-21)!=0

a∈R



We get rid of parentheses

-3a/a-9/a+21+15=0

We multiply all the terms by the denominator


-3a+21*a+15*a-9=0

We add all the numbers together, and all the variables

33a-9=0

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

33a=9

a=9/33

a=3/11

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