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x in (-oo:+oo)
(2/3)*x-3 = 4*x-12 // - 4*x-12
(2/3)*x-(4*x)-3+12 = 0
(2/3)*x-4*x-3+12 = 0
9-10/3*x = 0 // - 9
-10/3*x = -9 // : -10/3
x = -9/(-10/3)
x = 27/10
x = 27/10
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