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)
25/x = x/4 // - x/4
25/x-(x/4) = 0
25*x^-1-1/4*x^1 = 0
(25*x^0-1/4*x^2)/(x^1) = 0 // * x^2
x^1*(25*x^0-1/4*x^2) = 0
x^1
(-1/4)*x^2+25 = 0
(-1/4)*x^2+25 = 0
DELTA = 0^2-(4*25*(-1/4))
DELTA = 25
DELTA > 0
x = (25^(1/2)+0)/(2*(-1/4)) or x = (0-25^(1/2))/(2*(-1/4))
x = -10 or x = 10
x in { -10, 10}
x in { -10, 10 }
| 4x^2-31=49 | | 2y=4x-20 | | (t-5)/4=3 | | 7/1.5 | | 0=-2k^2+12k-10 | | 3/2x=-7 | | -m/4=-13 | | 6a+5*3a+5*8= | | -6=b/12 | | 2(5a+13)=84 | | 2x+1/3+3x-5/2=13/2 | | 6a+5(3a+8)= | | 6a+5(3a+8)-4= | | 3-4x+-8x=9 | | 1/6-9/6 | | 2x+1/3+3x-5/2= | | 2x+1/3+3x-5/2= | | 1/6-3/2 | | 3-3x=x-5 | | 3(7-4x)=21 | | 5x+12=-7-8x | | h(z)=8z+4 | | 25=k-7 | | 4(7-1x)=5(x+2) | | 5(u-1)=4(1-u)+81 | | 4(7-(x))=5(x+2) | | w=0.2 | | 2(y+5)-4(7-3y)=-74 | | 6x+8=(3x-7) | | 8+10y+2y^2=0 | | 2x/9=2/3 | | -20ln(6-h)+20ln(5)= |