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n in (-oo:+oo)
(1/2)*(8*n+3) = 45 // - 45
(1/2)*(8*n+3)-45 = 0
1/2*(8*n+3)-45 = 0
1/2*(8*n+3)-45 = 0
4*n-87/2 = 0
4*n-87/2 = 0
4*n-87/2 = 0 // + 87/2
4*n = 87/2 // : 4
n = 87/2/4
n = 87/8
n = 87/8
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