(-5/9÷20/36)+(-13/14×28/39)-(7/11÷21/44)÷-4/15
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Step-by-step explanation:
= (-5/9÷20/36)+(-13/14×28/39)-(7/11÷21/44)÷4/15
= -5/9×36/20-13/14×28/39-7/11×44/21÷4/15
= 4/4-2/3-4/3÷4/15
= 12-8-16/12÷4/15
= -12/12×15/4
= -15/4
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