(15+x)*(x+1)=(21+x)*(x)

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Solution for (15+x)*(x+1)=(21+x)*(x) equation: 



(15+x)(x+1)=(21+x)(x)

We move all terms to the left:

(15+x)(x+1)-((21+x)(x))=0

We add all the numbers together, and all the variables

(x+15)(x+1)-((x+21)x)=0

We multiply parentheses ..

(+x^2+x+15x+15)-((x+21)x)=0



We calculate terms in parentheses: -((x+21)x), so:

(x+21)x

We multiply parentheses

x^2+21x

Back to the equation:

-(x^2+21x)



We get rid of parentheses

x^2-x^2+x+15x-21x+15=0

We add all the numbers together, and all the variables

-5x+15=0

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

-5x=-15

x=-15/-5

x=+3

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