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6=u/2-4
We move all terms to the left:
6-(u/2-4)=0
We get rid of parentheses
-u/2+4+6=0
We multiply all the terms by the denominator
-u+4*2+6*2=0
We add all the numbers together, and all the variables
-1u+20=0
We move all terms containing u to the left, all other terms to the right
-u=-20
u=-20/-1
u=+20
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