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4=u/4-1
We move all terms to the left:
4-(u/4-1)=0
We get rid of parentheses
-u/4+1+4=0
We multiply all the terms by the denominator
-u+1*4+4*4=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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