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-21 -11
-12 24
12 -36
49 -13
-42 -8
-10 72
5) a) 15 -8 + x = 15 -8 -7
7 + x = 0
x = -7.
b) 13 + y = 0
y = -13
c) -23 +54 = x -23
31 = x-23
31 +23 = x
54 = x
d) 27-27 = z
0 = Z
6) a) -2
b) -35
c) -53
d) -15
e) 15 .
Espero que se entienda saludos.