tummy

I get the stuff… except with this part:

Taking moments around the point on the wall find the tension in the cable Tc
32.81 x 9.8 x 4 x 2 = 4 x Tc sin Ø
Tc = 643.1/sin Ø N”


I get the stuff… except with this part: Why do they multiply by 2 on the left side? There is the mass of the beam and g, and multiplying them together gives weight. Then you multiply by 4 to get the moment. But what about the 2?
Thanks
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