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x in (-oo:+oo)
-27 = (3/4)*x // - (3/4)*x
-((3/4)*x)-27 = 0
(-3/4)*x-27 = 0
-3/4*x-27 = 0 // + 27
-3/4*x = 27 // : -3/4
x = 27/(-3/4)
x = -36
x = -36
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