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2014-03-23T15:38:43-03:00
A)x+(+9)=13
4+9=13
R:4

b)x+(-6)=-10
-4-6=-10
R:-4

c)x+(-7)=0
7-7=0
R:7

d)x+(-3)=3
6-3=3
R:6

e)x+(+7)=-3
-10+7=-3
R:-10

f)(-20)+x=-18
-20+2=-18
R:2
3 5 3