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x in (-oo:+oo)
(x-9)/6 = 20/3 // - 20/3
(x-9)/6-(20/3) = 0
(x-9)/6-20/3 = 0
(3*(x-9))/(3*6)+(-20*6)/(3*6) = 0
3*(x-9)-20*6 = 0
3*x-147 = 0
(3*x-147)/(3*6) = 0
(3*x-147)/(3*6) = 0 // * 3*6
3*x-147 = 0
3*x-147 = 0 // + 147
3*x = 147 // : 3
x = 147/3
x = 49
x = 49
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