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-250.8=20.9x
We move all terms to the left:
-250.8-(20.9x)=0
We add all the numbers together, and all the variables
-(+20.9x)-250.8=0
We get rid of parentheses
-20.9x-250.8=0
We move all terms containing x to the left, all other terms to the right
-20.9x=250.8
x=250.8/-20.9
x=-12+2.8421709430404E-14/20.9
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