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x=31.1x+623
We move all terms to the left:
x-(31.1x+623)=0
We get rid of parentheses
x-31.1x-623=0
We add all the numbers together, and all the variables
-30.1x-623=0
We move all terms containing x to the left, all other terms to the right
-30.1x=623
x=623/-30.1
x=-20+7/10.033333333333
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