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7.9=i+12.7=
We move all terms to the left:
7.9-(i+12.7)=0
We get rid of parentheses
-i-12.7+7.9=0
We add all the numbers together, and all the variables
-1i-4.8=0
We move all terms containing i to the left, all other terms to the right
-i=4.8
i=4.8/-1
i=-4+0.8/1
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