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D( x )
3*x+6 = 0
3*x+6 = 0
3*x+6 = 0
3*x+6 = 0 // - 6
3*x = -6 // : 3
x = -6/3
x = -2
x in (-oo:-2) U (-2:+oo)
(2*x-24)/(3*x+6) = 0
2*x-24 = 0 // + 24
2*x = 24 // : 2
x = 24/2
x = 12
x = 12
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