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4i-50=2i-8
We move all terms to the left:
4i-50-(2i-8)=0
We get rid of parentheses
4i-2i+8-50=0
We add all the numbers together, and all the variables
2i-42=0
We move all terms containing i to the left, all other terms to the right
2i=42
i=42/2
i=21
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