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2.1j+1.2=11.7
We move all terms to the left:
2.1j+1.2-(11.7)=0
We add all the numbers together, and all the variables
2.1j-10.5=0
We move all terms containing j to the left, all other terms to the right
2.1j=10.5
j=10.5/2.1
j=5
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