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240/j=12
We move all terms to the left:
240/j-(12)=0
Domain of the equation: j!=0We multiply all the terms by the denominator
j∈R
-12*j+240=0
We add all the numbers together, and all the variables
-12j+240=0
We move all terms containing j to the left, all other terms to the right
-12j=-240
j=-240/-12
j=+20
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