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x in (-oo:+oo)
(x+1)/4+2*x-(x/2) = 9*x // - 9*x
(x+1)/4+2*x-(x/2)-(9*x) = 0
(x+1)/4+2*x-(x/2)-9*x = 0
(x+1)/4+2*x-x/2-9*x = 0
(2*(x+1))/(2*4)+(2*2*4*x)/(2*4)+(4*(-x))/(2*4)+(-9*2*4*x)/(2*4) = 0
2*(x+1)+2*2*4*x+4*(-x)-9*2*4*x = 0
18*x-4*x-72*x+2 = 0
14*x-72*x+2 = 0
2-58*x = 0
(2-58*x)/(2*4) = 0
(2-58*x)/(2*4) = 0 // * 2*4
2-58*x = 0
2-58*x = 0 // - 2
-58*x = -2 // : -58
x = -2/(-58)
x = 1/29
x = 1/29
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