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x in (-oo:+oo)
27 = (9*x)/2 // - (9*x)/2
27-((9*x)/2) = 0
(-9/2)*x+27 = 0
27-9/2*x = 0 // - 27
-9/2*x = -27 // : -9/2
x = -27/(-9/2)
x = 6
x = 6
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