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31=5u+6
We move all terms to the left:
31-(5u+6)=0
We get rid of parentheses
-5u-6+31=0
We add all the numbers together, and all the variables
-5u+25=0
We move all terms containing u to the left, all other terms to the right
-5u=-25
u=-25/-5
u=+5
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