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X in (-oo:+oo)
1/4-(X/9) = (4*X-9)/9 // - (4*X-9)/9
1/4-((4*X-9)/9)-(X/9) = 0
(-1*(4*X-9))/9-X/9+1/4 = 0
(-1*4*(4*X-9))/(4*9)+(4*(-X))/(4*9)+(1*9)/(4*9) = 0
4*(-X)-1*4*(4*X-9)+1*9 = 0
9-20*X+36 = 0
45-20*X = 0
(45-20*X)/(4*9) = 0
(45-20*X)/(4*9) = 0 // * 4*9
45-20*X = 0
45-20*X = 0 // - 45
-20*X = -45 // : -20
X = -45/(-20)
X = 9/4
X = 9/4
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