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68=4u+16
We move all terms to the left:
68-(4u+16)=0
We get rid of parentheses
-4u-16+68=0
We add all the numbers together, and all the variables
-4u+52=0
We move all terms containing u to the left, all other terms to the right
-4u=-52
u=-52/-4
u=+13
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