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x+7,5 - druga liczba
x+x+7,5 = 25
2x = 17,5 / : 2
x = 8,75 - pierwsza liczba
8,75 + 7,5 = 16, 25 - druga liczba
7,5y+x=25
2x=-y+25-7,5y+25
2x=-6,5y+50
2x+6,5y=50
8,5xy=50
x=50/8,5
y=50/8,5
8,75+7,5=16,25
Sprawdzenie
16,25+8,75=25