If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( a )
4/a = 0
a = 0
4/a = 0
4/a = 0
4*a^-1 = 0 // : 4
a^-1 = 0
a należy do O
a = 0
a = 0
a in (-oo:0) U (0:+oo)
(4/a)^-3 = 0
1/64*a^3 = 0 // : 1/64
a^3 = 0
a = 0
a in { 0}
a belongs to the empty set
| 35-7x=5 | | h=16t^2+8t+96 | | Ax+fy=k | | 9y^2-16y=0 | | 18y^2-33y+10=0 | | 9n-18=-4+2n | | 5y-6=-30+y | | -2y+3=4y+6 | | x^(-1/2)=2/3 | | 3.3x-32=2.5x+4 | | n=1.96 | | 5u^2=-13u-6 | | X(.2)=900 | | h=-16t^2+50t+448 | | 20x+7-5x=5x-7 | | x+39+x+7=8 | | 2/5-7(5.4) | | x(x+5)(x+7)(x+12)+150=0 | | 15+12=a | | 16x+22-2x=2x-22 | | 23+2x+6-5x=8 | | m^2+54=0 | | 16x+6-4x=4x-6 | | (9/4)-(y^2/5)=1 | | 4x^2+3=x+9 | | y=20-x/4 | | 4y+2=12-y | | 2x-1=(4x+3) | | x+(x+2)=6x | | 10y=7y-15 | | b^2-6b-24=0 | | .77=ln(x) |