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355=2.5x
We move all terms to the left:
355-(2.5x)=0
We add all the numbers together, and all the variables
-(+2.5x)+355=0
We get rid of parentheses
-2.5x+355=0
We move all terms containing x to the left, all other terms to the right
-2.5x=-355
x=-355/-2.5
x=+142
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