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-6=u/2+1
We move all terms to the left:
-6-(u/2+1)=0
We get rid of parentheses
-u/2-1-6=0
We multiply all the terms by the denominator
-u-1*2-6*2=0
We add all the numbers together, and all the variables
-1u-14=0
We move all terms containing u to the left, all other terms to the right
-u=14
u=14/-1
u=-14
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