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650=x+-0.2x
We move all terms to the left:
650-(x+-0.2x)=0
We add all the numbers together, and all the variables
-(+0.8x)+650=0
We get rid of parentheses
-0.8x+650=0
We move all terms containing x to the left, all other terms to the right
-0.8x=-650
x=-650/-0.8
x=812+0.39999999999998/0.8
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