(a-10)/a=40

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Solution for (a-10)/a=40 equation: 



(a-10)/a=40

We move all terms to the left:

(a-10)/a-(40)=0



Domain of the equation: a!=0

a∈R



We multiply all the terms by the denominator


(a-10)-40*a=0

We add all the numbers together, and all the variables

-40a+(a-10)=0

We get rid of parentheses

-40a+a-10=0

We add all the numbers together, and all the variables

-39a-10=0

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

-39a=10

a=10/-39

a=-10/39

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