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Metoda mersului invers:65+(45:9+81:a-2x0+3x4)-46=45

Răspuns :

65+(5+81:a-0+12)-46=45
65+(5+81:a+12)=45+46=91
5+81:a+12=91-65=26
5+81:a=26-12
5+81:a=14
81:a=9
a=81:9
a=9

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