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6u=7u-12
We move all terms to the left:
6u-(7u-12)=0
We get rid of parentheses
6u-7u+12=0
We add all the numbers together, and all the variables
-1u+12=0
We move all terms containing u to the left, all other terms to the right
-u=-12
u=-12/-1
u=+12
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