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)
(1/5)*a+4/a = 3 // - 3
(1/5)*a+4/a-3 = 0
1/5*a^1+4*a^-1-3*a^0 = 0
(1/5*a^2-3*a^1+4*a^0)/(a^1) = 0 // * a^2
a^1*(1/5*a^2-3*a^1+4*a^0) = 0
a^1
(1/5)*a^2-3*a+4 = 0
(1/5)*a^2-3*a+4 = 0
DELTA = (-3)^2-(4*4*(1/5))
DELTA = 29/5
DELTA > 0
a = ((29/5)^(1/2)+3)/(2*(1/5)) or a = (3-(29/5)^(1/2))/(2*(1/5))
a = 5/2*((29/5)^(1/2)+3) or a = 5/2*(3-(29/5)^(1/2))
a in { 5/2*(3-(29/5)^(1/2)), 5/2*((29/5)^(1/2)+3)}
a in { 5/2*(3-(29/5)^(1/2)), 5/2*((29/5)^(1/2)+3) }
| 2k+9+5k-3= | | 3(r+4)-r=2(r+6) | | x^4/3-7x^2/3-10=0 | | 11x+5y=-55 | | 3X-20=15+2X | | -8x+16y=32 | | 2(x+3)6x-4x+6= | | (9/2)*(4)^(-1/2)+(3/2)*(4)^(1/2) | | 5(y-7)/2=-2y | | (5x+8)(x+2)=29x+28 | | -x-4/7=x+1/2+2/7 | | 1/3(5x-5)=4 | | 0.02(12)+0.05x=0.10(6+x) | | k+3(2k-5)=4(k-2)-7 | | 4x-6x-16=-2x+5-16 | | x-7=86 | | 3(4/5)+3(7/9)+4(1/5) | | 15(5c-1)-10=93c+19 | | x+22=2x+5 | | (4/3)^1/2 | | .20(y-1)+.18y=.06y-.09(20) | | 16=(3/4)x+8 | | -7(x+6)-41=3-23 | | (3+y)(4y+1)=0 | | 10-(3n-8)=3-4n | | (3x-2)(x+3)-6x=24 | | 44x+4y=-40 | | 9x+6=36x | | 9x+6=3x-x | | x/-7=-5-(-6) | | x+x+30+x+60=180 | | -2(x-1)-7(8-2x)=11(x-4)+6 |