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Center of mass of three objects

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The center of mass of three objects is located a (1,0). one object with a mass of 5.0 kg is at (-2,-1) and a second object with a mass of 2.0 kg is at (0,0). What are the coordinates of the third mass of 3.0 kg?

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In general, if you have any number of objects in a plane, the center of mass coordinates (x_c,y_c) are determined by equation

(sum of all m_i)* (x_c,y_c) = m_1(x_1,y_1) + m_2(x_2,y_2) + m_3(x_3,y_3) + ...,

where m_i, x_i, and ...

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