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-21=-7/6u
We move all terms to the left:
-21-(-7/6u)=0
Domain of the equation: 6u)!=0We get rid of parentheses
u!=0/1
u!=0
u∈R
7/6u-21=0
We multiply all the terms by the denominator
-21*6u+7=0
Wy multiply elements
-126u+7=0
We move all terms containing u to the left, all other terms to the right
-126u=-7
u=-7/-126
u=1/18
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