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47=4u+15
We move all terms to the left:
47-(4u+15)=0
We get rid of parentheses
-4u-15+47=0
We add all the numbers together, and all the variables
-4u+32=0
We move all terms containing u to the left, all other terms to the right
-4u=-32
u=-32/-4
u=+8
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