2j+1=21

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Solution for 2j+1=21 equation: 



2j+1=21

We move all terms to the left:

2j+1-(21)=0

We add all the numbers together, and all the variables

2j-20=0

We move all terms containing j to the left, all other terms to the right

2j=20

j=20/2

j=10

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