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12.4=x/8
We move all terms to the left:
12.4-(x/8)=0
We add all the numbers together, and all the variables
-(+x/8)+12.4=0
We get rid of parentheses
-x/8+12.4=0
We multiply all the terms by the denominator
-x+(12.4)*8=0
We add all the numbers together, and all the variables
-1x+99.2=0
We move all terms containing x to the left, all other terms to the right
-x=-99.2
x=-99.2/-1
x=99+0.2/1
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