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)
x+8/x+3+4 = 6*x-(12/x)-4 // - 6*x-(12/x)-4
x-(6*x)+8/x+12/x+3+4+4 = 0
x-6*x+8/x+12/x+3+4+4 = 0
20*x^-1-5*x^1+11*x^0 = 0
(11*x^1-5*x^2+20*x^0)/(x^1) = 0 // * x^2
x^1*(11*x^1-5*x^2+20*x^0) = 0
x^1
11*x-5*x^2+20 = 0
11*x-5*x^2+20 = 0
DELTA = 11^2-(-5*4*20)
DELTA = 521
DELTA > 0
x = (521^(1/2)-11)/(-5*2) or x = (-521^(1/2)-11)/(-5*2)
x = (521^(1/2)-11)/(-10) or x = (521^(1/2)+11)/10
x in { (521^(1/2)-11)/(-10), (521^(1/2)+11)/10}
x in { (521^(1/2)-11)/(-10), (521^(1/2)+11)/10 }
| 49-x=45 | | -3x+1=46 | | K^2+8k+16=0 | | 9x+3=1.5(x+5) | | x-8/3=x+4/2 | | -21/4(-5/8) | | -21/4(-8/5) | | 3n-8=x | | (5-2x)(4-x)=2 | | -2x+5=-x-4 | | x-5(-2)=x-1(-3) | | 4x^3-12x+4=0 | | 2(2x+5)+6=2x+4 | | x+2=6x-38 | | 48=x+3x | | 9+3*x=15 | | 3/4n=5 | | -1/4-20/4 | | z+1.5=7.5 | | 18=-1.5x | | 81t^2-64=0 | | -2/8-3/8 | | (x^2y+9xy+12)+(-3x^2y+6xy+3)= | | 2(2x+7)-3=6-3(x-4) | | 6a-5=85 | | 0.18y+0.06(y+9000)=1500 | | x-2=1036 | | (10x)/3=(2x+5)/4 | | 2.6(x-.8)=9.3-x | | -20x=8 | | 10y+15=115 | | -4n-6=-2n |