-(-5,7)+(-19)-(+3,7)+(+39) = 5,7 -19-3,7+39 = (5,7-3,7) +(39-19) = 2 + 20 = 22
=5,7-19-3,7+39=(5,7-3,7)+(39-19)=2+20=22
-(-5,7)+(-19)-(+3,7)+(+39) = 5,7 -19-3,7+39 = (5,7-3,7) +(39-19) = 2 + 20 = 22
=5,7-19-3,7+39=(5,7-3,7)+(39-19)=2+20=22