3(i+1)=18

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Solution for 3(i+1)=18 equation: 



3(i+1)=18

We move all terms to the left:

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

We multiply parentheses

3i+3-18=0

We add all the numbers together, and all the variables

3i-15=0

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

3i=15

i=15/3

i=5

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