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b=krótszy
a-b=3
a=3+b
2,6a+2,4b=2a+2b+17
0,6a-0,4b=17
0,6(3+b)-0,4b=17
1,8+0,2b=17
0,2b=15,2
b=76
a=3+b=3+76
a=79