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a-17; b+17
a-17-25=b+17
a-42=b+17
a=b+59
b+59+b=99
2b=99-59=40
b=40:2=20
a=b+59=20+59=79
Raspuns final:
In primul cos sunt 79 de mere, iar in al doilea cos sunt 20 de mere.