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53=4u+9
We move all terms to the left:
53-(4u+9)=0
We get rid of parentheses
-4u-9+53=0
We add all the numbers together, and all the variables
-4u+44=0
We move all terms containing u to the left, all other terms to the right
-4u=-44
u=-44/-4
u=+11
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