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x in (-oo:+oo)
(-2/3)*x-9 = 2*x // - 2*x
(-2/3)*x-(2*x)-9 = 0
(-2/3)*x-2*x-9 = 0
-8/3*x-9 = 0 // + 9
-8/3*x = 9 // : -8/3
x = 9/(-8/3)
x = -27/8
x = -27/8
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