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 = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(-5/2)*x-8-4 = -2/x-4 // + -2/x-4
(-5/2)*x-(-2/x)-8-4+4 = 0
(-5/2)*x+2*x^-1-8-4+4 = 0
2*x^-1-5/2*x^1-8*x^0 = 0
(2*x^0-5/2*x^2-8*x^1)/(x^1) = 0 // * x^2
x^1*(2*x^0-5/2*x^2-8*x^1) = 0
x^1
(-5/2)*x^2-8*x+2 = 0
(-5/2)*x^2-8*x+2 = 0
DELTA = (-8)^2-(2*4*(-5/2))
DELTA = 84
DELTA > 0
x = (84^(1/2)+8)/(2*(-5/2)) or x = (8-84^(1/2))/(2*(-5/2))
x = (2*21^(1/2)+8)/(-5) or x = (8-2*21^(1/2))/(-5)
x in { (2*21^(1/2)+8)/(-5), (8-2*21^(1/2))/(-5)}
x in { (2*21^(1/2)+8)/(-5), (8-2*21^(1/2))/(-5) }
| 2/u-5=6/3u-15-4 | | 7x-29-4x=19 | | y=1.9x+350 | | 18/x*100=.15 | | X^3+9x^2+28x+20=0 | | 1/3(45x-18/7= | | 100-6q=64 | | a^3-6a^2+5a=0 | | 6x+5=x+50 | | 65/-5X | | 1/3(4x-18/7= | | 5u-5=-30 | | x+1.5x=800 | | -6x+10x-58=30 | | 9y+5=10y-6 | | 0.3z(z+5)=-2.3(z-1.5) | | 3y+45=3(5y+3) | | 0.25x=0.75 | | 3y-20=3x(5y+3) | | 7(3-2x)+8=39 | | 5x-2x+-12=24 | | 2x+3x=4(x-2) | | 6+2(y-4)=14 | | 5x^4-16x^3+12x^2=0 | | 2/5=14/n30 | | 2/a/8=5/10 | | (9+v)(2v+5)=0 | | 12a+4=5a+32 | | 9m-(2m-3)=20-4m | | 3(4x-20)+3=3x+78 | | x-(x*1/3)=25650 | | 15-(4m+6)=4+3m-16 |