I ONLY HAVE 30 MINS ASAP simplify 5a+7b-12a+6c-13b-22a+53c

Wow thats alot but it would be the 3 one

The earth's inner core is the earth's innermost part. it is primarily a solid ball with a radius of about 1,220 km (760 miles), which is about 70% of the moon's radius.[1][2] it is composed of an iron–nickel alloy and some light elements. the temperature at the inner core's surface is approximately 5,700 k (5,430 °c), which is about the temperature at the surface of the sun. 

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