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)
8/x-(5*x) = 4 // - 4
8/x-(5*x)-4 = 0
8/x-5*x-4 = 0
8*x^-1-5*x^1-4*x^0 = 0
(8*x^0-5*x^2-4*x^1)/(x^1) = 0 // * x^2
x^1*(8*x^0-5*x^2-4*x^1) = 0
x^1
8-5*x^2-4*x = 0
8-5*x^2-4*x = 0
DELTA = (-4)^2-(-5*4*8)
DELTA = 176
DELTA > 0
x = (176^(1/2)+4)/(-5*2) or x = (4-176^(1/2))/(-5*2)
x = (4*11^(1/2)+4)/(-10) or x = (4-4*11^(1/2))/(-10)
x in { (4*11^(1/2)+4)/(-10), (4-4*11^(1/2))/(-10)}
x in { (4*11^(1/2)+4)/(-10), (4-4*11^(1/2))/(-10) }
| 5x^2-78=48 | | a=10ln(a) | | x-1-(x-2)(x+2)=9 | | 7.5m+1.1-10m=4.3-2.5m-3.2+1.7 | | 2x-8x+29=5 | | -3(-2)+y=-5 | | 6y/z | | -39-20+y=-5 | | -13-4x=-21 | | 2*(x+3)=a | | -20x^2+12x+27=0 | | 2x(x+3)=a | | 0=6x^2+6 | | 5(x-1)-2(x^2+5x+6)-7(x+6)= | | x+3/10=-3/10 | | 6x(x-2)=11 | | -6+4x=34 | | -7b+4=39 | | 7-4m=51 | | 8x-2+3x+4= | | 14-y=18 | | -12+5x=-2 | | 10+7b=52 | | -7+4t=-23 | | 7n-6=-83 | | -4b-2=-2 | | 5-5a=15 | | 7m+6=76 | | 24/2-x=95 | | 10x^2-7x-3=0 | | -5+3a=-26 | | -5k+1=-9 |