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