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20800=0.6x+x
We move all terms to the left:
20800-(0.6x+x)=0
We add all the numbers together, and all the variables
-(+1.6x)+20800=0
We get rid of parentheses
-1.6x+20800=0
We move all terms containing x to the left, all other terms to the right
-1.6x=-20800
x=-20800/-1.6
x=+13000
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