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x in (-oo:+oo)
(X-1)/9-1 = (x-9)/10 // - (x-9)/10
(X-1)/9-((x-9)/10)-1 = 0
(X-1)/9+(-1*(x-9))/10-1 = 0
(10*(X-1))/(9*10)+(-1*9*(x-9))/(9*10)+(-1*9*10)/(9*10) = 0
10*(X-1)-1*9*(x-9)-1*9*10 = 0
10*X-9*x-90+71 = 0
10*X-9*x-19 = 0
(10*X-9*x-19)/(9*10) = 0
(10*X-9*x-19)/(9*10) = 0 // * 9*10
10*X-9*x-19 = 0
10*X-9*x-19 = 0 // - 10*X-19
-9*x = -(10*X-19) // : -9
x = (-(10*X-19))/(-9)
x = (19-(10*X))/(-9)
x = (19-(10*X))/(-9)
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