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(-20)+(+3)+(+5)+(-7)=-19
9+(-7)+10+(-3)+(-9)=0
(-0.6)+1.7+(+0.6)+(1.7)+(-9)=-5.6
9+(-7)+10+(-3)+(-9)=0
(-0.6)+1.7+(+0.6)+(1.7)+(-9)=-5.6
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(-20)+(+3)+(+5)+(-7)
=(-20-7)+(3+5)
=-27+8
=-19
9+(-7)+10+(-3)+(-9)
=9-9+10-(7+3)
=0
(-0.6)+1.7+(+0.6)+(1.7)+(-9)
=0.6-0.6+1.7+1.7-9
=3.4-9
=-5.6
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