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x in (-oo:+oo)
X/2+8 = 4*x+x/2-12 // - 4*x+x/2-12
X/2-(4*x)-(x/2)+8+12 = 0
X/2-4*x-(x/2)+8+12 = 0
1/2*X-9/2*x+20 = 0 // - 1/2*X+20
-9/2*x = -(1/2*X+20) // : -9/2
x = (-(1/2*X+20))/(-9/2)
x = 2/9*(1/2*X+20)
x = 2/9*(1/2*X+20)
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