x=31x+90

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Solution for x=31x+90 equation: 



x=31x+90

We move all terms to the left:

x-(31x+90)=0

We get rid of parentheses

x-31x-90=0

We add all the numbers together, and all the variables

-30x-90=0

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

-30x=90

x=90/-30

x=-3

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