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7u+5(u-6)=6
We move all terms to the left:
7u+5(u-6)-(6)=0
We multiply parentheses
7u+5u-30-6=0
We add all the numbers together, and all the variables
12u-36=0
We move all terms containing u to the left, all other terms to the right
12u=36
u=36/12
u=3
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