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x in (-oo:+oo)
(1/3)*x+12 = (5/6)*x-9 // - (5/6)*x-9
(1/3)*x-((5/6)*x)+9+12 = 0
(1/3)*x+(-5/6)*x+9+12 = 0
21-1/2*x = 0 // - 21
-1/2*x = -21 // : -1/2
x = -21/(-1/2)
x = 42
x = 42
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