120/0.4=300/x

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Solution for 120/0.4=300/x equation: 



120/0.4=300/x

We move all terms to the left:

120/0.4-(300/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

-(+300/x)+120/0.4=0

We add all the numbers together, and all the variables

-(+300/x)+300=0

We get rid of parentheses

-300/x+300=0

We multiply all the terms by the denominator


300*x-300=0

We add all the numbers together, and all the variables

300x-300=0

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

300x=300

x=300/300

x=1

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