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15j-14j+2j-3j+4j=20
We move all terms to the left:
15j-14j+2j-3j+4j-(20)=0
We add all the numbers together, and all the variables
4j-20=0
We move all terms containing j to the left, all other terms to the right
4j=20
j=20/4
j=5
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