(-1/3)-{1÷(2/3×5/7)+8-[5-1/2-1/4]} simplify pls.....
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-1/3-21/10+8-17/4
=-1/3-21/10+15/4
=-1/3-21/10+15/4
=-40-252+450/120
=-292+450/120
158/120
79/60
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