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)
32/40 = 4/x // - 4/x
32/40-(4/x) = 0
32/40-4*x^-1 = 0
-4*x^-1 = -4/5 // : -4
x^-1 = 1/5
-1 < 0
1/(x^1) = 1/5 // * x^1
1 = 1/5*x^1 // : 1/5
5 = x^1
x = 5
x = 5
| 21n-35=20n-45 | | 8(3+2x)= | | 6g^2+5h^2-3g^2-8h^2= | | 3+2x+4x=12 | | X+-2=-6 | | y+7=5(x-5) | | 4c-8=10+10c | | 21n+2=24n+11 | | 9/63=x/7 | | 2f+10=3f | | 4y-12+xy-3x=0 | | 6n-6=4n-14 | | (12N-9)+5n= | | X^2-95=0 | | (m^2+4)=0 | | 66000=(0.10*x)+x | | (4u+3)(4-u)=0 | | 7/9=×/63 | | 10n-30=7n | | (4u+3)(u-3)=0 | | 4+5p=3+4p+5 | | -54+7x=-10 | | 5q^2+13q-6=0 | | 7n+30=4n | | 6x+c=3d | | 0.3k+1.4=4.2+-0.1k | | y=.75x-11 | | 8(n-6)=6n-56 | | -(5x-w)-4(-6w-4x)= | | X+-9=-19 | | x+.20x=207.81 | | -10+n=4-n |