15-21/a+3=12

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Solution for 15-21/a+3=12 equation: 



15-21/a+3=12

We move all terms to the left:

15-21/a+3-(12)=0



Domain of the equation: a!=0

a∈R



We add all the numbers together, and all the variables

-21/a+6=0

We multiply all the terms by the denominator


6*a-21=0

We add all the numbers together, and all the variables

6a-21=0

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

6a=21

a=21/6

a=3+1/2

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