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5x-3x =300
2x = 300
x = 300/2
x=150
150-60=90
Resolvemos :
3/5 de m = 60
m * 3/5 = 60
3m/5 = 60
3m = 60 * 5
3m = 300
m = 300/3
m = 100
Solución : Tenías 100 soles
Ahora, como te quedaste con
el total que tenías era 100, restamos
100 - 60 = 40
Solución : Te queda 40 soles