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x in (-oo:+oo)
(4/9)*((1/3)*x+6) = (5/18)*x+1/3 // - (5/18)*x+1/3
(4/9)*((1/3)*x+6)-((5/18)*x)-(1/3) = 0
(4/9)*((1/3)*x+6)+(-5/18)*x-1/3 = 0
4/9*(1/3*x+6)+(-5*x)/18-1/3 = 0
(4/9*3*18*(1/3*x+6))/(3*18)+(-5*3*x)/(3*18)+(-1*18)/(3*18) = 0
4/9*3*18*(1/3*x+6)-5*3*x-1*18 = 0
144-7*x-18 = 0
126-7*x = 0
(126-7*x)/(3*18) = 0
(126-7*x)/(3*18) = 0 // * 3*18
126-7*x = 0
126-7*x = 0 // - 126
-7*x = -126 // : -7
x = -126/(-7)
x = 18
x = 18
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