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12.6j+8=10.2j+4
We move all terms to the left:
12.6j+8-(10.2j+4)=0
We get rid of parentheses
12.6j-10.2j-4+8=0
We add all the numbers together, and all the variables
2.4j+4=0
We move all terms containing j to the left, all other terms to the right
2.4j=-4
j=-4/2.4
j=-1+1/1.5
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