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x in (-oo:+oo)
(2/3)*x-4 = 2*x+9 // - 2*x+9
(2/3)*x-(2*x)-9-4 = 0
(2/3)*x-2*x-9-4 = 0
-4/3*x-13 = 0 // + 13
-4/3*x = 13 // : -4/3
x = 13/(-4/3)
x = -39/4
x = -39/4
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