¿Qué propiedad de la resta de polinomios dice que la diferencia de dos polinomios es siempre un polinomio?

Jordan rides his bike 6 7/15 miles every day to deliver newspapers and to go to and from school. if his ride to and from school is 4 3/10 miles, how many miles is the trip to deliver newspapers? 1 1/3 1 1/6 2 1/6 2 4/5

What can each term of the equation be multiplied by to eliminate the fractions before solving? x – + 2x = + x 2 6 10 12

Could someone me with this question i’ve been stuck on it for 20 minutes