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.5(I-4)=4I-8
We move all terms to the left:
.5(I-4)-(4I-8)=0
We multiply parentheses
0.5I-(4I-8)-2=0
We get rid of parentheses
0.5I-4I+8-2=0
We add all the numbers together, and all the variables
-3.5I+6=0
We move all terms containing I to the left, all other terms to the right
-3.5I=-6
I=-6/-3.5
I=1+2.5/3.5
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