2(i+1)=18

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Solution for 2(i+1)=18 equation: 



2(i+1)=18

We move all terms to the left:

2(i+1)-(18)=0

We multiply parentheses

2i+2-18=0

We add all the numbers together, and all the variables

2i-16=0

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

2i=16

i=16/2

i=8

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