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n in (-oo:+oo)
(1/18)*(n-90) = (1/15)*(n+75)-5 // - (1/15)*(n+75)-5
(1/18)*(n-90)-((1/15)*(n+75))+5 = 0
(1/18)*(n-90)+(-1/15)*(n+75)+5 = 0
1/18*(n-90)-1/15*(n+75)+5 = 0
1/18*(n-90)-1/15*(n+75)+5 = 0
5-1/90*n-10 = 0
-1/90*n-5 = 0
-1/90*n-5 = 0
-1/90*n-5 = 0 // + 5
-1/90*n = 5 // : -1/90
n = 5/(-1/90)
n = -450
n = -450
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