If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( x )
-x-4 = 0
-x-4 = 0
-x-4 = 0
-x-4 = 0 // + 4
-x = 4 // * -1
x = -4
x in (-oo:-4) U (-4:+oo)
-(96/(-x-4)) = 0
(-1*96)/(-x-4) = 0
x belongs to the empty set
| 5+3(2/3x-30) | | n/h-6=11 | | y-2=3(x+5) | | 5x+7y=-19 | | -h/-3-4=13 | | x^3+10x^2+25x-12=0 | | 1/5x=8/1 | | x^2+18x-106=0 | | x^2-14x+22.5=0 | | -3+7+(-8)= | | x^2+19x-106=0 | | -h/3-4=23 | | 7x+9x-46=115-7x | | 2.5x-4=1.5x | | -3+7+(8)= | | X+2/3=27/8 | | -9x-3=-4-3 | | -7+21=-4 | | 0.1y+x=18 | | 3w=3/73/1 | | 8-(-9)-7+2= | | 2x^2+14x-22.5=0 | | 5x+8x-88=44-9x | | 11/2+m/-2=31/2 | | x^2=6x+14 | | q/-7=4 | | 5(-9x-4)-5x=-3 | | 2x-(3x-2)+5=17 | | M+1/6=5/6 | | k-69=-55 | | -7+3(-7x+5)=-5 | | 2x-8x+48=3x+39 |