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.64=x/1000
We move all terms to the left:
.64-(x/1000)=0
We add all the numbers together, and all the variables
-(+x/1000)+.64=0
We add all the numbers together, and all the variables
-(+x/1000)+0.64=0
We get rid of parentheses
-x/1000+0.64=0
We multiply all the terms by the denominator
-x+(0.64)*1000=0
We add all the numbers together, and all the variables
-1x+640=0
We move all terms containing x to the left, all other terms to the right
-x=-640
x=-640/-1
x=+640
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