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(1⅗ + 1⅔ ) : [(-4)-(- 1⅔)]=
= (8/5 + 5/3) : (- 4 + 1⅔)=
= (24/15 + 25/15) : ( - 4 + 5/3)=
= (49/15 ) : ( - 12/3 + 5/3) =
= (49/15 ) : ( -7/3) =
= (49/15)*(-3/7) =
= - 7/5