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3=73500-i/21000
We move all terms to the left:
3-(73500-i/21000)=0
We add all the numbers together, and all the variables
-(-i/21000+73500)+3=0
We get rid of parentheses
i/21000-73500+3=0
We multiply all the terms by the denominator
i-73500*21000+3*21000=0
We add all the numbers together, and all the variables
i-1543437000=0
We move all terms containing i to the left, all other terms to the right
i=1543437000
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