-0.7-(+1.3)+(-1.3)=-0.7-1.3-1.3=-3.3-1-(-1.1)·(-(-0.9))=-1+1.1·0.9=-1+0.99=-0.01
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-0.7-(+1.3)+(-1.3)=-0.7-1.3-1.3=-3.3
-1-(-1.1)·(-(-0.9))=-1+1.1·0.9=-1+0.99=-0.01