If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( a )
2.3*a = 0
2.3*a = 0
2.3*a = 0
2.3*a = 0 // : 2.3
a = 0
a in (-oo:0) U (0:+oo)
6.9/(2.3*a) = 0.6 // - 0.6
6.9/(2.3*a)-0.6 = 0
3*a^-1 = 0.6 // : 3
a^-1 = 0.2
-1 < 0
1/(a^1) = 0.2 // * a^1
1 = 0.2*a^1 // : 0.2
5 = a^1
a = 5
a = 5
| 0.157=3*x/4.472 | | 5x-y=-27 | | 13.8-(1.4/b)=13.6 | | X^2+4x+8=10 | | 54.75/3.75*4=x | | c(x)=0.0001x-0.09x+20x+1200 | | 62.8/5=x | | Z/4=3 | | 5(3+4x)-8=107 | | 22x/35=-25 | | 13x^3-x^2+13x-1=0 | | 722/-2=-88 | | 16.9-(s*4.1)=8.7 | | y=(-(5x^7)/x^8-6 | | 1.3*(v+15.4)=60.32 | | -3/7y=-15 | | 87x/43=-75 | | -6=-4p+3q | | 15.3/51=t | | 14/sqrt(10x) | | 30*0+1= | | f(x)=5x^2+13x-28 | | 35.91/57=n | | x=2/0 | | x=0/12 | | 72x/(-2)=88 | | x=10+3+6 | | 2x-3y-9z=0 | | y*3x-5=0 | | 5x+2y-2z=2 | | 5m+6=2m+12 | | N-6/3=10 |