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-20.4=1.2+u/6
We move all terms to the left:
-20.4-(1.2+u/6)=0
We add all the numbers together, and all the variables
-(u/6+1.2)-20.4=0
We get rid of parentheses
-u/6-1.2-20.4=0
We multiply all the terms by the denominator
-u-(1.2)*6-(20.4)*6=0
We add all the numbers together, and all the variables
-1u-129.6=0
We move all terms containing u to the left, all other terms to the right
-u=129.6
u=129.6/-1
u=-129+0.59999999999999/1
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