81=4x+13

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Solution for 81=4x+13 equation: 



81=4x+13

We move all terms to the left:

81-(4x+13)=0

We get rid of parentheses

-4x-13+81=0

We add all the numbers together, and all the variables

-4x+68=0

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

-4x=-68

x=-68/-4

x=+17

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