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x in (-oo:+oo)
(x-6)/6 = (x-9)/2 // - (x-9)/2
(x-6)/6-((x-9)/2) = 0
(x-6)/6+(-1*(x-9))/2 = 0
(2*(x-6))/(2*6)+(-1*6*(x-9))/(2*6) = 0
2*(x-6)-1*6*(x-9) = 0
42-4*x = 0
(42-4*x)/(2*6) = 0
(42-4*x)/(2*6) = 0 // * 2*6
42-4*x = 0
42-4*x = 0 // - 42
-4*x = -42 // : -4
x = -42/(-4)
x = 21/2
x = 21/2
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