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Three particles of masses m,m and 4kg ar...

Three particles of masses `m`,`m` and `4kg` are kept at a verticals of triangle `ABC`. Coordinates of `A`, `B` and `C` are `(1,2)` , `(3,2)` and `(-2,-2)` respectively such that the centre of mass lies at origin. Find the value of mass `m`.
Hint. `x_(cm)=(sum_(i-1)^(3)m_(i)x_(i))/(sum_(i=1)^(3)m_(i))`, `y_(cm)=(sum_(i=1)^(3)m_(i)y_(i))/(sum_(i=1)^(3)m_(i))`

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