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Since we know that if a structure is in the state of equilibrium, every part of it is also in equilibrium, we can split the structure into two separate members as shown below.
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alone. However, in this case there is a single roller at point B. From our previous discussion on support reactions we know that in such a case, there is only one unknown force in the normal direction. Recognizing this fact alone is the key in being able to solve for the reactions in this problem.