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31=u/5-4
We move all terms to the left:
31-(u/5-4)=0
We get rid of parentheses
-u/5+4+31=0
We multiply all the terms by the denominator
-u+4*5+31*5=0
We add all the numbers together, and all the variables
-1u+175=0
We move all terms containing u to the left, all other terms to the right
-u=-175
u=-175/-1
u=+175
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