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13u=14+6u
We move all terms to the left:
13u-(14+6u)=0
We add all the numbers together, and all the variables
13u-(6u+14)=0
We get rid of parentheses
13u-6u-14=0
We add all the numbers together, and all the variables
7u-14=0
We move all terms containing u to the left, all other terms to the right
7u=14
u=14/7
u=2
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