80/40=30/x

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Solution for 80/40=30/x equation: 



80/40=30/x

We move all terms to the left:

80/40-(30/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

-(+30/x)+80/40=0

We add all the numbers together, and all the variables

-(+30/x)+2=0

We get rid of parentheses

-30/x+2=0

We multiply all the terms by the denominator


2*x-30=0

We add all the numbers together, and all the variables

2x-30=0

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

2x=30

x=30/2

x=15

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