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18=v/0.4
We move all terms to the left:
18-(v/0.4)=0
We add all the numbers together, and all the variables
-(+v/0.4)+18=0
We get rid of parentheses
-v/0.4+18=0
We multiply all the terms by the denominator
-v+18*0.4=0
We add all the numbers together, and all the variables
-1v+7.2=0
We move all terms containing v to the left, all other terms to the right
-v=-7.2
v=-7.2/-1
v=7+0.2/1
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