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82.8=x-0.04x
We move all terms to the left:
82.8-(x-0.04x)=0
We add all the numbers together, and all the variables
-(+0.96x)+82.8=0
We get rid of parentheses
-0.96x+82.8=0
We move all terms containing x to the left, all other terms to the right
-0.96x=-82.8
x=-82.8/-0.96
x=86+0.24/0.96
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