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-37=-9+7u
We move all terms to the left:
-37-(-9+7u)=0
We add all the numbers together, and all the variables
-(7u-9)-37=0
We get rid of parentheses
-7u+9-37=0
We add all the numbers together, and all the variables
-7u-28=0
We move all terms containing u to the left, all other terms to the right
-7u=28
u=28/-7
u=-4
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