Si al triple de mi dinero le agregara 8 soles, tendría menos de 62 soles; pero si a la mitad de mi dinero le agregara 9 soles, tendría más de 17 soles. ¿Cuánto dinero tengo?

since there are the same amount of marbles of getting a blue one wold be low as far from that it would also be low!    

*hope this : d*

c minus thirteen equals negative two. to find c add thirteen two both sides. this cancels out the thirteen and gives you eleven on the other side. this leaves you with c equals eleven.