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25=5i+13
We move all terms to the left:
25-(5i+13)=0
We get rid of parentheses
-5i-13+25=0
We add all the numbers together, and all the variables
-5i+12=0
We move all terms containing i to the left, all other terms to the right
-5i=-12
i=-12/-5
i=2+2/5
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