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x in (-oo:+oo)
X = (1/2)*(x-4)-x-5 // - (1/2)*(x-4)-x-5
X-((1/2)*(x-4))+x+5 = 0
(-1/2)*(x-4)+X+x+5 = 0
X-1/2*(x-4)+x+5 = 0
X-1/2*(x-4)+x+5 = 0
X-1/2*x+x+2+5 = 0
X+1/2*x+2+5 = 0
X+1/2*x+7 = 0
X+1/2*x+7 = 0
X+1/2*x+7 = 0 // - X+7
1/2*x = -(X+7) // : 1/2
x = (-(X+7))/1/2
x = -2*(X+7)
x = -2*(X+7)
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