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D( x )
-5*x-2 = 0
-5*x-2 = 0
-5*x-2 = 0
-5*x-2 = 0 // + 2
-5*x = 2 // : -5
x = 2/(-5)
x = -2/5
x in (-oo:-2/5) U (-2/5:+oo)
-2/(-5*x-2) > 0
( -2 )
-2 > 0
x belongs to the empty set
( -5*x-2 )
-5*x-2 > 0 // + 2
-5*x > 2 // : -5
x < 2/(-5)
x < -2/5
(-oo:-2/5) (-2/5:+oo) -2 - - -5*x-2 + -
x in (-2/5:+oo)
(-2/5:+oo)
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