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126-{(63x2+109)x(75:25+21:3)}:10

Răspuns :

126-{(63×2:6+109)×(75:25+21:3)}:10=
=126-[(126:6+109)×(3+7)]:10
=126-[(21+109)×10]:10
=126-(130×10):10
=126-1300:10=126-130=-4