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x in (-oo:+oo)
(1/2)*x+3 = (2/3)*x // - (2/3)*x
(1/2)*x-((2/3)*x)+3 = 0
(1/2)*x+(-2/3)*x+3 = 0
3-1/6*x = 0 // - 3
-1/6*x = -3 // : -1/6
x = -3/(-1/6)
x = 18
x = 18
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