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x in (-oo:+oo)
(x-1)/2 = (x-9)/11 // - (x-9)/11
(x-1)/2-((x-9)/11) = 0
(x-1)/2+(-1*(x-9))/11 = 0
(11*(x-1))/(2*11)+(-1*2*(x-9))/(2*11) = 0
11*(x-1)-1*2*(x-9) = 0
9*x+7 = 0
(9*x+7)/(2*11) = 0
(9*x+7)/(2*11) = 0 // * 2*11
9*x+7 = 0
9*x+7 = 0 // - 7
9*x = -7 // : 9
x = -7/9
x = -7/9
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