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4/0.4=4.2/x
We move all terms to the left:
4/0.4-(4.2/x)=0
Domain of the equation: x)!=0We add all the numbers together, and all the variables
x!=0/1
x!=0
x∈R
-(+4.2/x)+4/0.4=0
We add all the numbers together, and all the variables
-(+4.2/x)+10=0
We get rid of parentheses
-4.2/x+10=0
We multiply all the terms by the denominator
10*x-4.2=0
We add all the numbers together, and all the variables
10x-4.2=0
We move all terms containing x to the left, all other terms to the right
10x=4.2
x=4.2/10
x=1.90909090909/4.54545454545
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