40=100x/(10+x)

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Solution for 40=100x/(10+x) equation: 



40=100x/(10+x)

We move all terms to the left:

40-(100x/(10+x))=0



Domain of the equation: (10+x))!=0

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

x)!=-10

x!=-10/1

x!=-10

x∈R



We add all the numbers together, and all the variables

-(100x/(x+10))+40=0

We multiply all the terms by the denominator


-(100x+40*(x+10))=0



We calculate terms in parentheses: -(100x+40*(x+10)), so:

100x+40*(x+10)

We multiply parentheses

100x+40x+400

We add all the numbers together, and all the variables

140x+400

Back to the equation:

-(140x+400)



We get rid of parentheses

-140x-400=0

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

-140x=400

x=400/-140

x=-2+6/7

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