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x in (-oo:+oo)
(-1/3)*(x-9) = (2/3)*x-((1/3)*x)-8+3 // - (2/3)*x-((1/3)*x)-8+3
(-1/3)*(x-9)-((2/3)*x)+(1/3)*x-3+8 = 0
(-1/3)*(x-9)+(-2/3)*x+(1/3)*x-3+8 = 0
(-2*x)/3-1/3*(x-9)+x/3-3+8 = 0
(-1/3*3*(x-9))/3+(-2*x)/3+x/3+(-3*3)/3+(3*8)/3 = 0
x-1/3*3*(x-9)-2*x-3*3+3*8 = 0
x-3*x-9+9+24 = 0
9-2*x-9+24 = 0
24-2*x = 0
(24-2*x)/3 = 0
(24-2*x)/3 = 0 // * 3
24-2*x = 0
24-2*x = 0 // - 24
-2*x = -24 // : -2
x = -24/(-2)
x = 12
x = 12
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