Newton’s law

Trying to calculate the mass of earth. I am given the mass of the second object (2.00 kg) and the attraction between the earth and the mass is 19.60 N.

I understand the concept and have successfully (I think) solved the problem using a newton calculator online. I would just like to know how to solve this without a plug and play. Here is what I have

F= (6.67*10^-11) * [(M1*2.00)/(6.40*10^6)^2] = 19.60 N

I arrived at M1 = 6.016*10^24

How can i set this up to solve using algebra?


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