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-4=u/4-2
We move all terms to the left:
-4-(u/4-2)=0
We get rid of parentheses
-u/4+2-4=0
We multiply all the terms by the denominator
-u+2*4-4*4=0
We add all the numbers together, and all the variables
-1u-8=0
We move all terms containing u to the left, all other terms to the right
-u=8
u=8/-1
u=-8
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