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-4=u/2-6
We move all terms to the left:
-4-(u/2-6)=0
We get rid of parentheses
-u/2+6-4=0
We multiply all the terms by the denominator
-u+6*2-4*2=0
We add all the numbers together, and all the variables
-1u+4=0
We move all terms containing u to the left, all other terms to the right
-u=-4
u=-4/-1
u=+4
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