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73=4u+13
We move all terms to the left:
73-(4u+13)=0
We get rid of parentheses
-4u-13+73=0
We add all the numbers together, and all the variables
-4u+60=0
We move all terms containing u to the left, all other terms to the right
-4u=-60
u=-60/-4
u=+15
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