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