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Resolver.
5a/4 - 20 = 100
5a/4 = 100 + 20
5a/4 = 120
5a = 120 * 4
5a = 480
a = 480/5
a = 96
Respuesta.
a = 96
Comprobación.
5a/4 - 20 = 100
(5 * 96)/4 - 20 = 100
480/4 - 20 = 100
120 - 20 = 100
100 = 100