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u/2+(-6)=(-9)
We move all terms to the left:
u/2+(-6)-((-9))=0
We add all the numbers together, and all the variables
u/2+3=0
We multiply all the terms by the denominator
u+3*2=0
We add all the numbers together, and all the variables
u+6=0
We move all terms containing u to the left, all other terms to the right
u=-6
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