IF Name the property shown
4+ 5 = 5+4
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Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?

Arational number that is equivalent to -20/4?

(-y to the power of 2 - 4y- to the power of 2 -6 y +3)