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12n+9=6-3
We move all terms to the left:
12n+9-(6-3)=0
We add all the numbers together, and all the variables
12n+9-3=0
We add all the numbers together, and all the variables
12n+6=0
We move all terms containing n to the left, all other terms to the right
12n=-6
n=-6/12
n=-1/2
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