Wpisz liczby -12, 6 i -11 w odpowiednie X.
9+X+X-X=20 20+X-X=-9-X
DZIĘKS ZA ROZWIĄZANIE :-)
9+-12+-11- 6 = -20
20+ -12 - -11 = -9-6
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9+-12+-11- 6 = -20
20+ -12 - -11 = -9-6