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3(-I+4)-5I+5=-15
We move all terms to the left:
3(-I+4)-5I+5-(-15)=0
We add all the numbers together, and all the variables
3(-1I+4)-5I+5-(-15)=0
We add all the numbers together, and all the variables
-5I+3(-1I+4)+20=0
We multiply parentheses
-5I-3I+12+20=0
We add all the numbers together, and all the variables
-8I+32=0
We move all terms containing I to the left, all other terms to the right
-8I=-32
I=-32/-8
I=+4
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