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j+2=2j+1
We move all terms to the left:
j+2-(2j+1)=0
We get rid of parentheses
j-2j-1+2=0
We add all the numbers together, and all the variables
-1j+1=0
We move all terms containing j to the left, all other terms to the right
-j=-1
j=-1/-1
j=1
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