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99=4i+20
We move all terms to the left:
99-(4i+20)=0
We get rid of parentheses
-4i-20+99=0
We add all the numbers together, and all the variables
-4i+79=0
We move all terms containing i to the left, all other terms to the right
-4i=-79
i=-79/-4
i=19+3/4
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