I3(y+5)=21

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Solution for I3(y+5)=21 equation: 



3(I+5)=21

We move all terms to the left:

3(I+5)-(21)=0

We multiply parentheses

3I+15-21=0

We add all the numbers together, and all the variables

3I-6=0

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

3I=6

I=6/3

I=2

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