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)
4*x-(1/x) = 0
4*x-x^-1 = 0
4*x^1-1*x^-1 = 0
(4*x^2-1*x^0)/(x^1) = 0 // * x^2
x^1*(4*x^2-1*x^0) = 0
x^1
4*x^2-1 = 0
4*x^2-1 = 0
DELTA = 0^2-(-1*4*4)
DELTA = 16
DELTA > 0
x = (16^(1/2)+0)/(2*4) or x = (0-16^(1/2))/(2*4)
x = 1/2 or x = -1/2
x in { -1/2, 1/2}
x in { -1/2, 1/2 }
| -24x^2+21x+15=0 | | 8(x-5)-6=26x-190 | | -16-4x=8x-7 | | 7x-8+3x=5x-13 | | -16-4x=8-7 | | -0.5x-5=0 | | 56x+9=89-5x | | 3/x+2=7 | | [9-2(4-1)]= | | 4y-3=6y+21 | | 3x+3-12=-5 | | 48/2^3+25*(9-7) | | c=2x+18 | | -7/2x+1+31/2=8 | | x^3-5x=14 | | -4+0.33x=0 | | 8(x-5)-6=26x-90 | | 2x-5=2x-35 | | -5/2z-15 | | 5+2[9-2(4-1)]= | | 7(x+3)+4=-3(x-6)-9 | | 4x+18=4x-102 | | 4(2x-1)=(x+4) | | 7/3x+1/3x=5x+14/3+7/3x | | 20-0.5x=0 | | 7x^3-7= | | 26/7+14/5 | | 2y+8-5y=-28 | | 12=2x/3-4 | | 13(3)-7-10(3)=2 | | 7x=x^2+-8 | | 4p+9/2=7 |