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42=-7/3u
We move all terms to the left:
42-(-7/3u)=0
Domain of the equation: 3u)!=0We get rid of parentheses
u!=0/1
u!=0
u∈R
7/3u+42=0
We multiply all the terms by the denominator
42*3u+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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