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a= 135-b reemplazando"a" 135-b-b=59
76=2b
38=b
reemplazando "b" :
a=135-b
a=135-38
a=97
a - b = 59
---------------------+
2a = 194
a = 194 / 2
a = 97
b = 135 - a
b = 135 - 97
b = 38
- (a + b) = -135
a - b = 59
-----------------------+
-2b = -76
b = 38
a = 59 + b
a = 59 + 38
a = 97