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-31=4u-3
We move all terms to the left:
-31-(4u-3)=0
We get rid of parentheses
-4u+3-31=0
We add all the numbers together, and all the variables
-4u-28=0
We move all terms containing u to the left, all other terms to the right
-4u=28
u=28/-4
u=-7
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