(6-1 5/9:7/15):2/3=(6-14/9:7/15):2/3=(6-10/3)*3/2=8/3*3/2=4
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(6-1 5/9:7/15):2/3=(6-14/9:7/15):2/3=(6-10/3)*3/2=8/3*3/2=4