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12u-7u+2u+2u-3u=6
We move all terms to the left:
12u-7u+2u+2u-3u-(6)=0
We add all the numbers together, and all the variables
6u-6=0
We move all terms containing u to the left, all other terms to the right
6u=6
u=6/6
u=1
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