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2#3=3(3)-5(2)
2#3=-1
M#N=3N-5M
4#6=3(6)-5(4)
4#6=-2
(2#3)#(4#6)
-1# -2
M#N=3N-5M
-1# -2=3(-2)-5(-1)
-1# -2= -6 - (-5)= -6+5= -1