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x in (-oo:+oo)
-12 = (2/3)*x // - (2/3)*x
-((2/3)*x)-12 = 0
(-2/3)*x-12 = 0
-2/3*x-12 = 0 // + 12
-2/3*x = 12 // : -2/3
x = 12/(-2/3)
x = -18
x = -18
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