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-20.9=u/6-1.7
We move all terms to the left:
-20.9-(u/6-1.7)=0
We get rid of parentheses
-u/6+1.7-20.9=0
We multiply all the terms by the denominator
-u+(1.7)*6-(20.9)*6=0
We add all the numbers together, and all the variables
-1u-115.2=0
We move all terms containing u to the left, all other terms to the right
-u=115.2
u=115.2/-1
u=-115+0.2/1
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