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0.8=x/250
We move all terms to the left:
0.8-(x/250)=0
We add all the numbers together, and all the variables
-(+x/250)+0.8=0
We get rid of parentheses
-x/250+0.8=0
We multiply all the terms by the denominator
-x+(0.8)*250=0
We add all the numbers together, and all the variables
-1x+200=0
We move all terms containing x to the left, all other terms to the right
-x=-200
x=-200/-1
x=+200
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