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