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n in (-oo:+oo)
(1/2)*n-5*n+3 = 3/4 // - 3/4
(1/2)*n-5*n-(3/4)+3 = 0
(1/2)*n-5*n-3/4+3 = 0
9/4-9/2*n = 0 // - 9/4
-9/2*n = -9/4 // : -9/2
n = -9/4/(-9/2)
n = 1/2
n = 1/2
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