(4+i)(4-1)=0

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Solution for (4+i)(4-1)=0 equation: 



(4+i)(4-1)=0

We add all the numbers together, and all the variables

(i+4)3=0

We multiply parentheses

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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