If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
(7/2)*d-(2/d) = 3/4-((1/4)*d) // - 3/4-((1/4)*d)
(7/2)*d+(1/4)*d-(2/d)-(3/4) = 0
(7/2)*d+(1/4)*d-2*d^-1-3/4 = 0
15/4*d^1-2*d^-1-3/4*d^0 = 0
(15/4*d^2-3/4*d^1-2*d^0)/(d^1) = 0 // * d^2
d^1*(15/4*d^2-3/4*d^1-2*d^0) = 0
d^1
(15/4)*d^2+(-3/4)*d-2 = 0
(15/4)*d^2+(-3/4)*d-2 = 0
DELTA = (-3/4)^2-(-2*4*(15/4))
DELTA = 489/16
DELTA > 0
d = ((489/16)^(1/2)-(-3/4))/(2*(15/4)) or d = (-(-3/4)-(489/16)^(1/2))/(2*(15/4))
d = 2/15*((489/16)^(1/2)+3/4) or d = 2/15*(3/4-(489/16)^(1/2))
d in { 2/15*(3/4-(489/16)^(1/2)), 2/15*((489/16)^(1/2)+3/4)}
d in { 2/15*(3/4-(489/16)^(1/2)), 2/15*((489/16)^(1/2)+3/4) }
| (9+4d)=15 | | 12(2k+11)=+12(2k+12) | | 22=64+m | | 2n+16=5n-5 | | -19x+5y=-17 | | K*-3-11=-20 | | -8=3(x-2) | | 550=8x | | 2(9x+9)-10x=8x+6-10 | | 7-6X=1.2-2X | | B-9/10b+6=11 | | 5/2-1 | | 5x-2x=51 | | 6h-15+12h+8=11 | | 5x-2+3x^2=0 | | 8(w+6)=7w-2 | | 350+x=3650 | | 2/3r+4=12 | | (-7i)+(2i)-(-2-4i)= | | -3(7x-5)+8=-21x+23 | | f(x)=-4+8 | | 12(2+2z)=-4z-4(-12z-1) | | (32.50x+3.30)+5.90x=220.70 | | 3y+39=16y | | 8(w+9)=7w-2 | | 3/7x+4 | | (32.50x+3.30)+5.90=220.70 | | -9/4-1/5u=-8/3 | | T=gr+g*vtforg | | 2/3x+8=-2 | | N+3+n+6=-(n+3)+5(1+2n) | | 1/3(a-6)=28 |