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120-40:8x[424:4-111:3+(256+46:2):3]:10=

Răspuns :

120-5x[106-37+(256+23):3]:10=
120-5(106-37+279:3):10=
120-5(106-37+93):10=
120-5x162:10=
120-81=39
39

120-5*[106-37+(256+23)/3]/10=
120-5*(106-37+279/3)/10=
120-5*(106-37+93)/10=
120-5*(69+93)/10=
120-5*162/10=
120-810/10=
120-81= 39
* = semnul inmultirii
/ = semnul impartirii