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126-[(63×2:6+109)×(75:25+21:3)]:10 ajutorr va roggg ..

Răspuns :

126-[(63×2:6+109)×(75:25+21:3)]:10=
=
126-[(126:6+109)×(3+7)]:10=
=126-[(21+109)×(3+7)]:10=
=126-(130×10):10=
=126-130=-4