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-7u+5(u+6)=16
We move all terms to the left:
-7u+5(u+6)-(16)=0
We multiply parentheses
-7u+5u+30-16=0
We add all the numbers together, and all the variables
-2u+14=0
We move all terms containing u to the left, all other terms to the right
-2u=-14
u=-14/-2
u=+7
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