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x in (-oo:+oo)
(2/3)*(m+1)-((1/4)*(3*M-3)) = 1 // - 1
(2/3)*(m+1)-((1/4)*(3*M-3))-1 = 0
(2/3)*(m+1)+(-1/4)*(3*M-3)-1 = 0
2/3*(m+1)-1/4*(3*M-3)-1 = 0
2/3*(m+1)-1/4*(3*M-3)-1 = 0
2/3*m-3/4*M-1+17/12 = 0
2/3*m-3/4*M+5/12 = 0
2/3*m-3/4*M+5/12 = 0
x belongs to the empty set
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