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-5=7u-9
We move all terms to the left:
-5-(7u-9)=0
We get rid of parentheses
-7u+9-5=0
We add all the numbers together, and all the variables
-7u+4=0
We move all terms containing u to the left, all other terms to the right
-7u=-4
u=-4/-7
u=4/7
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