If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( a )
3-(5*a) = 0
3-(5*a) = 0
3-(5*a) = 0
3-5*a = 0
3-5*a = 0 // - 3
-5*a = -3 // : -5
a = -3/(-5)
a = 3/5
a in (-oo:3/5) U (3/5:+oo)
(2*a-1)/(3-(5*a)) = 10 // - 10
(2*a-1)/(3-(5*a))-10 = 0
(2*a-1)/(3-5*a)-10 = 0
(2*a-1)/(3-5*a)+(-10*(3-5*a))/(3-5*a) = 0
2*a-10*(3-5*a)-1 = 0
52*a-31 = 0
(52*a-31)/(3-5*a) = 0
(52*a-31)/(3-5*a) = 0 // * 3-5*a
52*a-31 = 0
52*a-31 = 0 // + 31
52*a = 31 // : 52
a = 31/52
a = 31/52
| 3x^2=-56 | | 4x-y-11=0 | | 2x+5x+1=0 | | 0.25x-2=0.333333 | | x+45=5y | | x^3+y^3+-3a*x=0 | | (X+2)(x+2)=(x-3)(x+2) | | 6x=7-10y | | 2w-k=-12 | | 2(13x8)-7/8=12 | | 5w+3k=3 | | 16-(5m+8)=4+2m-17 | | 4y=67-9 | | 9m-26=-44+6m | | 7p-3=5+5p | | 4(2y-3)=2(5y+7) | | 3z+14=10z-14 | | d-2+2=-7 | | d-9+9=-13 | | d-27=-7 | | -3f=26-f | | u^2=16+36 | | y=11.89+(-0.3926*4.7) | | y=200+10x+0.25x^2 | | Y=11.89+(-0.3926*4.61) | | 10.08=11.89+(-0.3926*4.61) | | y=11.892-0.3926(7.61) | | 2x+1=16x+8 | | Q=1 | | y=11.892-0.3926(4.61) | | 10.08=11.892-0.3926(x) | | -2(13-2y)-3y=-18 |