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0.8=x/0.5
We move all terms to the left:
0.8-(x/0.5)=0
We add all the numbers together, and all the variables
-(+x/0.5)+0.8=0
We get rid of parentheses
-x/0.5+0.8=0
We multiply all the terms by the denominator
-x+(0.8)*0.5=0
We add all the numbers together, and all the variables
-1x+0.4=0
We move all terms containing x to the left, all other terms to the right
-x=-0.4
x=-0.4/-1
x=0.4/1
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