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-7u/2=-42
We move all terms to the left:
-7u/2-(-42)=0
We add all the numbers together, and all the variables
-7u/2+42=0
We multiply all the terms by the denominator
-7u+42*2=0
We add all the numbers together, and all the variables
-7u+84=0
We move all terms containing u to the left, all other terms to the right
-7u=-84
u=-84/-7
u=+12
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