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3.5j+8.5=40
We move all terms to the left:
3.5j+8.5-(40)=0
We add all the numbers together, and all the variables
3.5j-31.5=0
We move all terms containing j to the left, all other terms to the right
3.5j=31.5
j=31.5/3.5
j=9
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