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(2i-6)=90
We move all terms to the left:
(2i-6)-(90)=0
We get rid of parentheses
2i-6-90=0
We add all the numbers together, and all the variables
2i-96=0
We move all terms containing i to the left, all other terms to the right
2i=96
i=96/2
i=48
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