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45=15-(-6u)
We move all terms to the left:
45-(15-(-6u))=0
We calculate terms in parentheses: -(15-(-6u)), so:We get rid of parentheses
15-(-6u)
determiningTheFunctionDomain -(-6u)+15
We get rid of parentheses
6u+15
Back to the equation:
-(6u+15)
-6u-15+45=0
We add all the numbers together, and all the variables
-6u+30=0
We move all terms containing u to the left, all other terms to the right
-6u=-30
u=-30/-6
u=+5
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