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-7u/4=42
We move all terms to the left:
-7u/4-(42)=0
We multiply all the terms by the denominator
-7u-42*4=0
We add all the numbers together, and all the variables
-7u-168=0
We move all terms containing u to the left, all other terms to the right
-7u=168
u=168/-7
u=-24
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