(-3 7/15)+(-0,4)+(6 1/3)
-3 7/15+(-2/5)+(-6 1/3)=-10 1/5 -3+(-6)+(-7/15)+(-6/15)+(-5/15)=-9+(-18/15)=-9+(-1)+(-3/15)=-10+(-1/5)=-10 1/5