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x in (-oo:+oo)
(10-x)/9 = x+1 // - x+1
(10-x)/9-x-1 = 0
(10-x)/9+(9*(-x))/9+(-1*9)/9 = 0
9*(-x)-x-1*9+10 = 0
10-10*x-9 = 0
1-10*x = 0
(1-10*x)/9 = 0
(1-10*x)/9 = 0 // * 9
1-10*x = 0
1-10*x = 0 // - 1
-10*x = -1 // : -10
x = -1/(-10)
x = 1/10
x = 1/10
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