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21=3/5u
We move all terms to the left:
21-(3/5u)=0
Domain of the equation: 5u)!=0We add all the numbers together, and all the variables
u!=0/1
u!=0
u∈R
-(+3/5u)+21=0
We get rid of parentheses
-3/5u+21=0
We multiply all the terms by the denominator
21*5u-3=0
Wy multiply elements
105u-3=0
We move all terms containing u to the left, all other terms to the right
105u=3
u=3/105
u=1/35
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