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u/2+6=-6
We move all terms to the left:
u/2+6-(-6)=0
We add all the numbers together, and all the variables
u/2+12=0
We multiply all the terms by the denominator
u+12*2=0
We add all the numbers together, and all the variables
u+24=0
We move all terms containing u to the left, all other terms to the right
u=-24
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