A 10 kg mass hangs from a wire that is suspended from the intersection of two wires, as shown in the diagram below.

The *tension* in a wire is defined to be the force pulling the ends away from each other. For example, if g is the gravitational acceleration near Earth's surface, then the tension in the vertical wire (remembering that (force)=(mass)⋅(acceleration)) is 10 kg⋅g, where kg⋅g are the units of force.
The tension in the leftmost wire is x kg⋅g for some real number x. Find the value of x.