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