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x in (-oo:+oo)
x-(((2*x+15)^1)/2) = o // - o
x-(((2*x+15)^1)/2)-o = 0
x-((2*x+15)/2)-o = 0
(-1*(2*x+15))/2-o+x = 0
(-1*(2*x+15))/2+(2*(-o))/2+(2*x)/2 = 0
2*(-o)-1*(2*x+15)+2*x = 0
2*x-2*o-2*x-15 = 0
-2*o-15 = 0
(-2*o-15)/2 = 0
(-2*o-15)/2 = 0 // * 2
-2*o-15 = 0
x belongs to the empty set
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