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^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
25 = 100/(x^2) // - 100/(x^2)
25-(100/(x^2)) = 0
25-100*x^-2 = 0
-100*x^-2 = -25 // : -100
x^-2 = 1/4
-2 < 0
1/(x^2) = 1/4 // * x^2
1 = 1/4*x^2 // : 1/4
4 = x^2
x^2 = 4 // ^ 1/2
abs(x) = 2
x = 2 or x = -2
x in { 2, -2 }
| 4x+7=2x+-7 | | 8x(x-5)=5x+12 | | 2x^2-13+6=0 | | (8/c)-c=7 | | 83=3x | | 5x+8-2x=18+7x | | 2.4*(0.7)= | | (10-3t)=t+4 | | c=400-5x+0.125 | | 2y=-1/2y-40 | | 6x-2-5x=0 | | 8-6x+2=4x-10 | | -4x+7=1 | | 1-2x+1=16 | | 5Ix-3I=26 | | 10(x+3)-(-9x-4)=x-6+3 | | 11y+29/7 | | X*2-3x-18=0 | | 27+8x=-7(2-7x) | | 3x+1.5x=1.25 | | -4+16x=2x+13 | | b-4+9=289 | | 6(2x+4x-12x)=4x-4 | | 4m=3mn-2 | | 3(x-4)+2=(2-x) | | -w+4(w-3)=-12 | | 24+3x=0+-12 | | x^2+69=755 | | 6q-1=1-9+20 | | 3(y-2)+y=2(y+1) | | 49=-7-5-81n | | 1/3z+4=-2/3z |