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b ⇒ Denominador
a - 4 = b
a = b + 4
b + 4 + 7 5
------------- = ----
b + 7 6
6b + 66 = 5b + 35
b = - 31
a = b + 4
a = - 27
a - 27 27
--- = ------- = -----
b - 31 31