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x in (-oo:+oo)
27/4 = 12*x // - 12*x
27/4-(12*x) = 0
27/4-12*x = 0
27/4-12*x = 0 // - 27/4
-12*x = -27/4 // : -12
x = -27/4/(-12)
x = 9/16
x = 9/16
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