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2 liczba ---- x + 7,5
x + x + 7,5 = 25
2x + 7,5 = 25
2x = 25 - 7,5
2x = 17,5 /:2
x = 8,75
1 liczba ---- x = 8,75
2 liczba ---- x + 7,5 = 8,75 + 7,5 = 16,25
7,5 + x - druga liczba
x + 7,5 + x = 25
2x= 25 - 7,5
2x= 17,5
x= 8,75
7,5 + x = 16,25