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planteo una ecuación
x - (2/7x + 5/7*3/5x) = 6000 soles
x - (2/7x + 3/7 x) = 6000 soles
x - 5/7x = 6000 soles
2/7 x = 6000 soles
x = 6000 : 2/7
x = 21 000 soles
antes de gastar tenía 21000 soles
saludos