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x in (-oo:+oo)
-27 = (3/2)*x // - (3/2)*x
-((3/2)*x)-27 = 0
(-3/2)*x-27 = 0
-3/2*x-27 = 0 // + 27
-3/2*x = 27 // : -3/2
x = 27/(-3/2)
x = -18
x = -18
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