d=-(-4.5)+(-5.5)+(+6.3)-(+7.3) e=(+17.5)-(2.8)+(-4.5)-(-6.7) f=-(+1.1)-(+2.2)+(+3.3)-(-4.4)
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d=+4,5-5,5+6,3-7,3= -2
e=(+17.5)-(2.8)+(-4.5)-(-6.7)
e=17,5-2,8-4,5+6,7= 16,9
f=-(+1.1)-(+2.2)+(+3.3)-(-4.4)
f=1,1-2,2+3,3+4,4=6,6