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x in (-oo:+oo)
x = (9/4)*x-27 // - (9/4)*x-27
x-((9/4)*x)+27 = 0
x+(-9/4)*x+27 = 0
27-5/4*x = 0 // - 27
-5/4*x = -27 // : -5/4
x = -27/(-5/4)
x = 108/5
x = 108/5
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