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x in (-oo:+oo)
-27 = (9*x)/4 // - (9*x)/4
-((9*x)/4)-27 = 0
(-9/4)*x-27 = 0
-9/4*x-27 = 0 // + 27
-9/4*x = 27 // : -9/4
x = 27/(-9/4)
x = -12
x = -12
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