If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
v/7-(7/v) = 0
v/7-7*v^-1 = 0
1/7*v^1-7*v^-1 = 0
(1/7*v^2-7*v^0)/(v^1) = 0 // * v^2
v^1*(1/7*v^2-7*v^0) = 0
v^1
(1/7)*v^2-7 = 0
(1/7)*v^2-7 = 0
DELTA = 0^2-(-7*4*(1/7))
DELTA = 4
DELTA > 0
v = (4^(1/2)+0)/(2*(1/7)) or v = (0-4^(1/2))/(2*(1/7))
v = 7 or v = -7
v in { -7, 7}
v in { -7, 7 }
| 9c-8=-20+5c | | (v/7)-(7-v)=0 | | g^2+g=210 | | 5(x-1)-(x-2)=13 | | 10+10x+11x+4=180 | | 7x+2=32+4x | | 99/6=33 | | -2/9-(-3) | | 9x-1=30 | | 2x+10=1488 | | 2x+25=-6x+97 | | 6x+2+x=38 | | 5x+5x+80=180 | | y=BC-8 | | x+18y=10 | | x^2-6y^2=30 | | 20x^2+36x-8=0 | | 3(k-5)+2k-6=-31 | | 0.2y-0.4(y+12)=2 | | 4y+4-y=4+2y-7 | | 3/8=-1/4-3/5 | | x^2+7y^2=10000 | | y=-3x^2+9.1x | | -10+6x=-5x-10 | | 24+72= | | log[3](5x-2)=4 | | 4.62+7.7= | | 20=x(4) | | w-5.99=7.3 | | 12-6(w-3)=3(-5-3w)+21 | | 2/3=16/x-7 | | 3u=48-5u |