If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
55/a = 5 // - 5
55/a-5 = 0
55*a^-1 = 5 // : 55
a^-1 = 1/11
-1 < 0
1/(a^1) = 1/11 // * a^1
1 = 1/11*a^1 // : 1/11
11 = a^1
a = 11
a = 11
| 144=200x-60x^2+4x^3 | | 4H-1=4(.25) | | 6/1X3/8 | | 13=-11a+3a | | X-8=67 | | P+35=-45 | | 39=n+40 | | 3b-4=24 | | s/t^2/s^2/t | | 2(9x+8)=16 | | 2.6+7.8=3+x | | 1/4x=3/2x-6 | | x=16+2y+-3z | | (500-t)s+4s=0 | | cos(3x)-cos(2x)=2 | | 7x-6=5+4 | | 7(-P-1)+7p=-(p-3) | | -14+n=-(n+4) | | 5(y-2y)=12 | | 2-7x+4=0 | | 1.2*X=120 | | 2+3x+1=0 | | -3(x+4)=-5x+4 | | -7x+2=X+5 | | 6(4-6v)=24-v | | 1/8x-x=7/8 | | 3.6m+8.7-2.1m=-5.9+1.5m+14.6 | | (2a)(3b^2)= | | 1.2x-2.5=.4x+3.34 | | -32+6n=-4(7n+8) | | .05y+.1(5000-y)=.2y | | 1+8x+x=2x-13 |