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5=6+u
We move all terms to the left:
5-(6+u)=0
We add all the numbers together, and all the variables
-(u+6)+5=0
We get rid of parentheses
-u-6+5=0
We add all the numbers together, and all the variables
-1u-1=0
We move all terms containing u to the left, all other terms to the right
-u=1
u=1/-1
u=-1
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