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7-2u=-9u
We move all terms to the left:
7-2u-(-9u)=0
We get rid of parentheses
-2u+9u+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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