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