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n in (-oo:+oo)
(1/2)*n-4 = (-2/3)*n-(15/2) // - (-2/3)*n-(15/2)
(1/2)*n-((-2/3)*n)+15/2-4 = 0
(1/2)*n+(2/3)*n+15/2-4 = 0
7/6*n+7/2 = 0 // - 7/2
7/6*n = -7/2 // : 7/6
n = -7/2/7/6
n = -3
n = -3
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