Deflection of simply-supported beam problem. Please see the attached image of an example problem from a textbook:
I have absolutely no idea why
A = - (wL^3)/24
0 = (wL^4)/12 - (wL^4)/24 +AL
is used in the determination of A.
I especially do not know why (wL^4)/12 is used in the above equation.
I would have thought that A would represent the left beam support, where I also would have thought that x = 0. But, according to the example in the attached image, x at A = L.
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