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x in (-oo:+oo)
(1/2)*x+9 = (5/6)*x // - (5/6)*x
(1/2)*x-((5/6)*x)+9 = 0
(1/2)*x+(-5/6)*x+9 = 0
9-1/3*x = 0 // - 9
-1/3*x = -9 // : -1/3
x = -9/(-1/3)
x = 27
x = 27
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