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3u-(-1)=7
We move all terms to the left:
3u-(-1)-(7)=0
determiningTheFunctionDomain 3u-7-(-1)=0
We add all the numbers together, and all the variables
3u-6=0
We move all terms containing u to the left, all other terms to the right
3u=6
u=6/3
u=2
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