21/5=(13-x)/x

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Solution for 21/5=(13-x)/x equation: 



21/5=(13-x)/x

We move all terms to the left:

21/5-((13-x)/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

-((-1x+13)/x)+21/5=0

We calculate fractions


(-((-1x+13)*5)/x*5)+21x/x*5)=0



We calculate terms in parentheses: +(-((-1x+13)*5)/x*5), so:

-((-1x+13)*5)/x*5

We multiply all the terms by the denominator


-((-1x+13)*5)



We calculate terms in parentheses: -((-1x+13)*5), so:

(-1x+13)*5

We multiply parentheses

-5x+65

Back to the equation:

-(-5x+65)



We get rid of parentheses

5x-65

Back to the equation:

+(5x-65)



We get rid of parentheses

5x+21x/x*5)-65=0

We multiply all the terms by the denominator


5x*x*5)-65+21x=0

Wy multiply elements

25x^3*5=0

We do not support expression: x^3

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