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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