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sabemos que:
1 = 7/7
entonces:
7/7 f - 2/7 f -20 = 1/5 f + 16
5/7 f -1/5 f = 16+20
por común múltiplo (5*7 = 35):
25/35 f - 7/35 f = 36
18/35 f = 36
f = 36*35/18
f = 70
Tenías 70
Saludos.......