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12i+18=20i+10
We move all terms to the left:
12i+18-(20i+10)=0
We get rid of parentheses
12i-20i-10+18=0
We add all the numbers together, and all the variables
-8i+8=0
We move all terms containing i to the left, all other terms to the right
-8i=-8
i=-8/-8
i=1
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