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2P(-(m-1)+1)=-m+1+1=-m+2
3 P(2m-1)= 2(2m-1)-4=4m-2-4 =4m-6
P(2m+1)= 2(2m+1)-4=4m+2-4=4m-2
4m-6- (4m-2)= 4m-6-4m+2=-4
.... tienes que ir sustituyendo la x , y haciendo la operación que corresponda :)