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23=u/2-(-15)
We move all terms to the left:
23-(u/2-(-15))=0
We multiply all the terms by the denominator
-(u+23*2-(-15))=0
We calculate terms in parentheses: -(u+23*2-(-15)), so:We get rid of parentheses
u+23*2-(-15)
We add all the numbers together, and all the variables
u+61
Back to the equation:
-(u+61)
-u-61=0
We add all the numbers together, and all the variables
-1u-61=0
We move all terms containing u to the left, all other terms to the right
-u=61
u=61/-1
u=-61
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