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10 ecuaciones
a) x = 31
31 + 2 = 33
b) x = 20
20 + 7= 27
c) x = 35
35 - 5 = 30
d) x = 56
56 - 22 = 34
e) x = 4
8 + 5 - 1 = 26 - 14 = 12
f) x = 0
0 + 6 = 324 / 3 / 2 - 48 = 6
g) x = 65
65 - 6 = 79 - 20 = 59
h) x = 7
35 + 1 = 36
i) x = 22
44 + 9 = 53
j) x = 23
69 + 1 = 70
k) x = 20
160 + 13 = 173
l) x = 2
10 + 2 - 14 + 7 = 1
la segunda
a con 3
b con 4
c con 1
d con 2