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