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x in (-oo:+oo)
(1/3)*(6*x-9) = 4*x-12 // - 4*x-12
(1/3)*(6*x-9)-(4*x)+12 = 0
(1/3)*(6*x-9)-4*x+12 = 0
1/3*(6*x-9)-4*x+12 = 0
1/3*(6*x-9)-4*x+12 = 0
12-2*x-3 = 0
9-2*x = 0
9-2*x = 0
9-2*x = 0 // - 9
-2*x = -9 // : -2
x = -9/(-2)
x = 9/2
x = 9/2
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