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x- pierwsza liczba
y- druga liczba
x+y=200
25/100x +20/100y=14 /×100
x=200-y
*25x+20y=1400 teraz podstawiamy
* 25(200-y)+25y=1400
5000 -25y+20y=1400
-5y=-360 /:(-5)
y=72
x=128