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4u+7(u-6)=13
We move all terms to the left:
4u+7(u-6)-(13)=0
We multiply parentheses
4u+7u-42-13=0
We add all the numbers together, and all the variables
11u-55=0
We move all terms containing u to the left, all other terms to the right
11u=55
u=55/11
u=5
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