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7u+5(u+7)=19
We move all terms to the left:
7u+5(u+7)-(19)=0
We multiply parentheses
7u+5u+35-19=0
We add all the numbers together, and all the variables
12u+16=0
We move all terms containing u to the left, all other terms to the right
12u=-16
u=-16/12
u=-1+1/3
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