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x=numero de taps
x = 2x+50
7
7x=2x+50
7x-2x=50
5x=50
x=10
comprobando:
x=2x+50
7
10=2(10)+50
7
10=70
7
espero que te sirva
x = 2x+50
7
7x=2x+50
7x-2x=50
5x=50
x=50/5
x=10
Espero te ayude.