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-u/2=23
We move all terms to the left:
-u/2-(23)=0
We multiply all the terms by the denominator
-u-23*2=0
We add all the numbers together, and all the variables
-1u-46=0
We move all terms containing u to the left, all other terms to the right
-u=46
u=46/-1
u=-46
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