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(11+i)5=90
We move all terms to the left:
(11+i)5-(90)=0
We add all the numbers together, and all the variables
(i+11)5-90=0
We multiply parentheses
5i+55-90=0
We add all the numbers together, and all the variables
5i-35=0
We move all terms containing i to the left, all other terms to the right
5i=35
i=35/5
i=7
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