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D( x )
6*x+12 = 0
6*x+12 = 0
6*x+12 = 0
6*x+12 = 0 // - 12
6*x = -12 // : 6
x = -12/6
x = -2
x in (-oo:-2) U (-2:+oo)
(8-(9*x))/(6*x+12) = 0
(8-9*x)/(6*x+12) = 0
8-9*x = 0 // - 8
-9*x = -8 // : -9
x = -8/(-9)
x = 8/9
x = 8/9
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