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3(7u-6)=276
We move all terms to the left:
3(7u-6)-(276)=0
We multiply parentheses
21u-18-276=0
We add all the numbers together, and all the variables
21u-294=0
We move all terms containing u to the left, all other terms to the right
21u=294
u=294/21
u=14
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