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j/2-9=-7
We move all terms to the left:
j/2-9-(-7)=0
We add all the numbers together, and all the variables
j/2-2=0
We multiply all the terms by the denominator
j-2*2=0
We add all the numbers together, and all the variables
j-4=0
We move all terms containing j to the left, all other terms to the right
j=4
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