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338=x4.5
We move all terms to the left:
338-(x4.5)=0
We add all the numbers together, and all the variables
-(+x4.5)+338=0
We get rid of parentheses
-x4.5+338=0
We move all terms containing x to the left, all other terms to the right
-x4.5=-338
x=-338/1
x=-338
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