If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
196/f = 14 // - 14
196/f-14 = 0
196*f^-1 = 14 // : 196
f^-1 = 1/14
-1 < 0
1/(f^1) = 1/14 // * f^1
1 = 1/14*f^1 // : 1/14
14 = f^1
f = 14
f = 14
| -6+n=3n-5n | | 2(5-2y)-y=-15 | | -6x-78=-11x+45 | | 3+4a-3b=5a-3b | | 7=-5k+4k | | -144=-4(6b+6) | | 2x=-6/7 | | 3p+27=4(p+4)+8 | | 1-8k=15-6k | | 4m+5-3m= | | 1/2=-13 | | (40/r)-r=6 | | -7+4n=-75 | | 10x-x=2x-2 | | -13x=13y | | 3x+2x^2-4=0 | | s^3(3s^4-2s)= | | 5/7x-3=7 | | 5t-t^2=-50 | | 2/5p-3/10=7/15p-1 | | -5(4r-8)=80 | | b/4-3=-5 | | 1/2-7/2a=5/a | | 2z+t=1 | | (5y+1)(3y-7)=90 | | 5y+3xy=10 | | -8(1+4n)=248 | | -z+12+5z=-2z+36 | | 6-5b-5=-9 | | 7(12/3-3 | | 3senx+4cosx=5 | | 96=-8n |