I3.1a-4=89

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Solution for I3.1a-4=89 equation: 



3.1I-4=89

We move all terms to the left:

3.1I-4-(89)=0

We add all the numbers together, and all the variables

3.1I-93=0

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

3.1I=93

I=93/3.1

I=30

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