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x in (-oo:+oo)
b = (x-3)/n // - (x-3)/n
b-((x-3)/n) = 0
(-1*(x-3))/n+b = 0
(-1*(x-3))/n+(b*n)/n = 0
b*n-1*(x-3) = 0
b*n-x+3 = 0
(b*n-x+3)/n = 0
(b*n-x+3)/n = 0 // * n
b*n-x+3 = 0
b*n-x+3 = 0 // - b*n+3
-x = -(b*n+3) // * -1
x = b*n+3
x = b*n+3
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