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x in (-oo:+oo)
18 = (4/3)*x-((3/2)*x) // - (4/3)*x-((3/2)*x)
(3/2)*x-((4/3)*x)+18 = 0
(-4/3)*x+(3/2)*x+18 = 0
1/6*x+18 = 0 // - 18
1/6*x = -18 // : 1/6
x = -18/1/6
x = -108
x = -108
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