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-u/4=-3
We move all terms to the left:
-u/4-(-3)=0
We add all the numbers together, and all the variables
-u/4+3=0
We multiply all the terms by the denominator
-u+3*4=0
We add all the numbers together, and all the variables
-1u+12=0
We move all terms containing u to the left, all other terms to the right
-u=-12
u=-12/-1
u=+12
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