At the end of the year 2016, the populat...

At the end of the year 2016, the population of villages Kovad, Varud, Chikkali is `5x^2-3y^2`,`7y^2+2xy` and `9x^2+4xy` respectively. At the beginning of the year 2017, `x^2+xy-y^2`, `5xy` and `3x^2+xy` persons from each of the three villages respectively. went to another village for education then what is the remaining total population of these three villages?

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