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.3I+7=3I+8
We move all terms to the left:
.3I+7-(3I+8)=0
We get rid of parentheses
.3I-3I-8+7=0
We add all the numbers together, and all the variables
-2.7I-1=0
We move all terms containing I to the left, all other terms to the right
-2.7I=1
I=1/-2.7
I=-1/2.7
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