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51=5u+16
We move all terms to the left:
51-(5u+16)=0
We get rid of parentheses
-5u-16+51=0
We add all the numbers together, and all the variables
-5u+35=0
We move all terms containing u to the left, all other terms to the right
-5u=-35
u=-35/-5
u=+7
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