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x in (-oo:+oo)
-1.2815516 = (x-15)/2 // - (x-15)/2
-((x-15)/2)-1.2815516 = 0
(-1*(x-15))/2-1.2815516 = 0
(-1*(x-15))/2+(-1.2815516*2)/2 = 0
-1*(x-15)-1.2815516*2 = 0
12.4368968-x = 0
(12.4368968-x)/2 = 0
(12.4368968-x)/2 = 0 // * 2
12.4368968-x = 0
12.4368968-x = 0 // - 12.4368968
-x = -12.4368968 // * -1
x = 12.4368968
x = 12.4368968
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