31=61-90x

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Solution for 31=61-90x equation: 



31=61-90x

We move all terms to the left:

31-(61-90x)=0

We add all the numbers together, and all the variables

-(-90x+61)+31=0

We get rid of parentheses

90x-61+31=0

We add all the numbers together, and all the variables

90x-30=0

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

90x=30

x=30/90

x=1/3

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