120÷ [17-{15-3(8-2)}]
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120÷[17-{15-3(6)}]
120÷[17-{15-3×6}]
120÷[17-{15-18}]
120÷[17-{-3}]
120÷[17+3]
120÷[20]
120÷20
6 is the answer...
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this is ur ans!!!!!!!
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