15/3=90/x

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Solution for 15/3=90/x equation: 



15/3=90/x

We move all terms to the left:

15/3-(90/x)=0



Domain of the equation: x)!=0

x!=0/1

x!=0

x∈R



We add all the numbers together, and all the variables

-(+90/x)+15/3=0

We add all the numbers together, and all the variables

-(+90/x)+5=0

We get rid of parentheses

-90/x+5=0

We multiply all the terms by the denominator


5*x-90=0

We add all the numbers together, and all the variables

5x-90=0

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

5x=90

x=90/5

x=18

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