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antonio: 3x 3x+8 3x+12
maria: x x+8 x+12
la edad de maría sera 5/9, para dar la igualdad se le multiplica por 9/5
9/5(x+12)=3x+12
(9x+108)/5=3x+12
9x+108=5*(3x+12)
9x+108=15x+60
108-60=15x-9x
48=6x
48/6=x
8=x
hace hoy dentro
antonio: 24 32 36
maria: 8 16 20