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18=-10.4+x/3
We move all terms to the left:
18-(-10.4+x/3)=0
We add all the numbers together, and all the variables
-(x/3-10.4)+18=0
We get rid of parentheses
-x/3+10.4+18=0
We multiply all the terms by the denominator
-x+(10.4)*3+18*3=0
We add all the numbers together, and all the variables
-1x+85.2=0
We move all terms containing x to the left, all other terms to the right
-x=-85.2
x=-85.2/-1
x=85+0.2/1
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