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-4-u=10+7
We move all terms to the left:
-4-u-(10+7)=0
We add all the numbers together, and all the variables
-u-4-17=0
We add all the numbers together, and all the variables
-1u-21=0
We move all terms containing u to the left, all other terms to the right
-u=21
u=21/-1
u=-21
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