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7-3u=-10u
We move all terms to the left:
7-3u-(-10u)=0
We get rid of parentheses
-3u+10u+7=0
We add all the numbers together, and all the variables
7u+7=0
We move all terms containing u to the left, all other terms to the right
7u=-7
u=-7/7
u=-1
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