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180 (n - 2) entre n = angulo interno
como ya tienes el angulo interno nada mas tienes que despejar
180 (n - 2)/ n = 156
n esta dividiendo pasa multiplicando
180 (n - 2) = 156n
180n - 360 = 156n
180n - 156n = 360
24n = 360
n = 360/24
n= 15