(x+13)21=(x-9)8

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Solution for (x+13)21=(x-9)8 equation: 



(x+13)21=(x-9)8

We move all terms to the left:

(x+13)21-((x-9)8)=0

We multiply parentheses

21x-((x-9)8)+273=0



We calculate terms in parentheses: -((x-9)8), so:

(x-9)8

We multiply parentheses

8x-72

Back to the equation:

-(8x-72)



We get rid of parentheses

21x-8x+72+273=0

We add all the numbers together, and all the variables

13x+345=0

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

13x=-345

x=-345/13

x=-26+7/13

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