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D( x )
4-(2*x) = 0
4-(2*x) = 0
4-(2*x) = 0
4-2*x = 0
4-2*x = 0 // - 4
-2*x = -4 // : -2
x = -4/(-2)
x = 2
x in (-oo:2) U (2:+oo)
(-3*x-5)/(4-(2*x)) = 0
(-3*x-5)/(4-2*x) = 0
-3*x-5 = 0 // + 5
-3*x = 5 // : -3
x = 5/(-3)
x = -5/3
x = -5/3
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