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x in (-oo:+oo)
(1/3)*x-6 = (2/3)*x+9 // - (2/3)*x+9
(1/3)*x-((2/3)*x)-9-6 = 0
(1/3)*x+(-2/3)*x-9-6 = 0
-1/3*x-15 = 0 // + 15
-1/3*x = 15 // : -1/3
x = 15/(-1/3)
x = -45
x = -45
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