If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( x )
2*x+1 = 0
2*x+1 = 0
2*x+1 = 0
2*x+1 = 0 // - 1
2*x = -1 // : 2
x = -1/2
x in (-oo:-1/2) U (-1/2:+oo)
(12*((6*x+3)/8))/(2*x+1) = 0
(12*(6*x+3))/(8*(2*x+1)) = 0
6*x+3 = 0 // - 3
6*x = -3 // : 6
x = -3/6
x = -1/2
x in { -1/2}
x belongs to the empty set
| x-0.20x=40 | | x+2+8x=4x-1 | | X^3-36x=16(x-6) | | 4x-6=-6-4x | | 2x^2-56x-58=0 | | x+x+8=342 | | 4x-3+3x+16= | | h^3+6h^2+12h=0 | | 52=8+4x | | 5x-7=x+29 | | x-0.15x=21.76 | | 35x-14=36x-1 | | 3.14x^2-x-29(3.14)=0 | | 6+3q=4q | | 22x+70=17x | | 1.2-3.76=-3.4X+2.9 | | 3/4x=4/5x+5/2 | | -2z=-z+8 | | 1-x=5-(x+7) | | (2x/x+1)=(2x-1/x) | | 3.25+n=12.75 | | 2x^2+12x+17=5 | | 3x-9y=-7 | | x-.20x=40 | | y-5=-4/9(18) | | 4(y+8)-7=15 | | -2d-2=3d+8 | | x-0.15=21.76 | | 5.9-b=2 | | f=(9/5)(18+32) | | 3=(6-x)/9 | | 67+t=113 |