Three objects lie along the xx$-$axis. A $3\mathrm{.}00$ kgkg object is at the origin, a $2\mathrm{.}00$ kgkg object is at xx $=1\mathrm{.}50$ mm$,$ and a $1\mathrm{.}20$ kgkg object is at an unknown position. The center of mass of the system of three objects is at xx $=-0\mathrm{.}200$ mm$.$ What is the position of the $1\mathrm{.}20$ kgkg object?

Express your answer with the appropriate units.

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x$1\mathrm{.}20$kgx$1\mathrm{.}20$kg $=$