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(-9+15i)-(7-4i)=-i15
We move all terms to the left:
(-9+15i)-(7-4i)-(-i15)=0
We add all the numbers together, and all the variables
-(-1i^15)+(15i-9)-(-4i+7)=0
We get rid of parentheses
1i^15+15i+4i-9-7=0
We do not support eipression: i^15
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