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x+y=77. x-y=13. care sun numerele

Răspuns :

x+y=77

x-y=13

x=77-y

77-y-y=13

-2y=13-77

-2y=-64

y=32

x+32=77

x=77-32

x=45

verificare:

45+32=77

45-32=13