31=85-13x-21

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Solution for 31=85-13x-21 equation: 



31=85-13x-21

We move all terms to the left:

31-(85-13x-21)=0

We add all the numbers together, and all the variables

-(-13x+64)+31=0

We get rid of parentheses

13x-64+31=0

We add all the numbers together, and all the variables

13x-33=0

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

13x=33

x=33/13

x=2+7/13

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