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3.9=x/8
We move all terms to the left:
3.9-(x/8)=0
We add all the numbers together, and all the variables
-(+x/8)+3.9=0
We get rid of parentheses
-x/8+3.9=0
We multiply all the terms by the denominator
-x+(3.9)*8=0
We add all the numbers together, and all the variables
-1x+31.2=0
We move all terms containing x to the left, all other terms to the right
-x=-31.2
x=-31.2/-1
x=31+0.2/1
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