21/a=7,5

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Solution for 21/a=7,5 equation: 



21/a=7.5

We move all terms to the left:

21/a-(7.5)=0



Domain of the equation: a!=0

a∈R



We add all the numbers together, and all the variables

21/a-7.5=0

We multiply all the terms by the denominator


-(7.5)*a+21=0

We multiply parentheses

-7.5a+21=0

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

-7.5a=-21

a=-21/-7.5

a=2+6/7.5

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