40=(40x)/(x+20)

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Solution for 40=(40x)/(x+20) equation: 



40=(40x)/(x+20)

We move all terms to the left:

40-((40x)/(x+20))=0



Domain of the equation: (x+20))!=0

x∈R



We multiply all the terms by the denominator


-(40x+40*(x+20))=0



We calculate terms in parentheses: -(40x+40*(x+20)), so:

40x+40*(x+20)

We multiply parentheses

40x+40x+800

We add all the numbers together, and all the variables

80x+800

Back to the equation:

-(80x+800)



We get rid of parentheses

-80x-800=0

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

-80x=800

x=800/-80

x=-10

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