-3/4+(2/5+(-4/7)=(-3/4+2/5)+(-4)/7
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-3/4+(2/5+(-4/7)=(-3/4+2/5)+(-4)/7
=-3/4+[2/5-4/7]=(-3/4+2/5)+(-4)/7
= -3/4+[14-20/35]=(-15+8/20)+(-4)/7
=-3/4+[-6/35]=(-7/20)-4/7
= -9/39=-4/20
=-180+156/780
=24/780
= 0.030
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