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2x=25
x=12,5
3x=37,5
5x=62,5
x- pierwsza liczba
x+25 - druga liczba
x/x+25= 3/5
5x= 3(x+25)
5x=3x+75
5x-3x=75
2x=75/:2
x= 37,5
y= x+25= 37,5+25= 62,5