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x in (-oo:+oo)
27/4 = (9/4)*x // - (9/4)*x
27/4-((9/4)*x) = 0
(-9/4)*x+27/4 = 0
27/4-9/4*x = 0 // - 27/4
-9/4*x = -27/4 // : -9/4
x = -27/4/(-9/4)
x = 3
x = 3
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