I3x+3I=15

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Solution for I3x+3I=15 equation: 



3I+3=15

We move all terms to the left:

3I+3-(15)=0

We add all the numbers together, and all the variables

3I-12=0

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

3I=12

I=12/3

I=4

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