x/(x+20)=90

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Solution for x/(x+20)=90 equation: 



x/(x+20)=90

We move all terms to the left:

x/(x+20)-(90)=0



Domain of the equation: (x+20)!=0

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

x!=-20

x∈R



We multiply all the terms by the denominator


x-90*(x+20)=0

We multiply parentheses

x-90x-1800=0

We add all the numbers together, and all the variables

-89x-1800=0

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

-89x=1800

x=1800/-89

x=-20+20/89

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