13x=81+4x

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Solution for 13x=81+4x equation: 



13x=81+4x

We move all terms to the left:

13x-(81+4x)=0

We add all the numbers together, and all the variables

13x-(4x+81)=0

We get rid of parentheses

13x-4x-81=0

We add all the numbers together, and all the variables

9x-81=0

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

9x=81

x=81/9

x=9

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