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27=u/4+9
We move all terms to the left:
27-(u/4+9)=0
We get rid of parentheses
-u/4-9+27=0
We multiply all the terms by the denominator
-u-9*4+27*4=0
We add all the numbers together, and all the variables
-1u+72=0
We move all terms containing u to the left, all other terms to the right
-u=-72
u=-72/-1
u=+72
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