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x in (-oo:+oo)
-x = (5-x-4)/2 // - (5-x-4)/2
-((5-x-4)/2)-x = 0
(-1*(1-x))/2-x = 0
(-1*(1-x))/2+(2*(-x))/2 = 0
2*(-x)-1*(1-x) = 0
-x-1 = 0
(-x-1)/2 = 0
(-x-1)/2 = 0 // * 2
-x-1 = 0
-x-1 = 0 // + 1
-x = 1 // * -1
x = -1
x = -1
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