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)
100-(4*(100/x)) = 16 // - 16
100-(4*(100/x))-16 = 0
100-400*x^-1-16 = 0
-400*x^-1 = -84 // : -400
x^-1 = 21/100
-1 < 0
1/(x^1) = 21/100 // * x^1
1 = 21/100*x^1 // : 21/100
100/21 = x^1
x = 100/21
x = 100/21
| x^2+3xy= | | 100-100/x*4=83 | | 100-(100/x)*4=83 | | 3(n+7)+2(n+8)= | | 3/4x-1/2y=8 | | -6x^2=-180 | | -6x^2=-189 | | 40-5x=4x+23 | | 2(5z-3)=14 | | 4x+6=2x*4 | | 1-x^2-x^4=0 | | 14d+8=6d+32 | | (w/2)+7=21 | | 64x^2-8x-12=0 | | 2x^2+xy-4=xy+2y^2-15 | | X^2-y^2+11=0 | | -((7b+9y)/(8b))-((4b-7y)/(8b)) | | 7b/12+3b/4=b/3+9 | | 6a+7=39/4+1/2a | | 1/4m+1/2m=5/8 | | 0.3+1.5/5.5-1.2 | | 2a^2*4a= | | 2a^2*3a^2= | | (1.44+x)/2=5 | | -k(k^3-4)= | | 72-9n=530 | | 9a-(4+a)=7(a+5) | | 5ab^3= | | 650/9-9n=530 | | x-2=1/12 | | =f(f-g)2 | | -6n+15-3n-8= |