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