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-u+15=15+
We move all terms to the left:
-u+15-(15+)=0
We add all the numbers together, and all the variables
-u+15-0=0
We add all the numbers together, and all the variables
-1u+15=0
We move all terms containing u to the left, all other terms to the right
-u=-15
u=-15/-1
u=+15
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