2(i+1)=21

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Solution for 2(i+1)=21 equation: 



2(i+1)=21

We move all terms to the left:

2(i+1)-(21)=0

We multiply parentheses

2i+2-21=0

We add all the numbers together, and all the variables

2i-19=0

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

2i=19

i=19/2

i=9+1/2

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