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)
7 = 4/v+2 // - 4/v+2
7-(4/v)-2 = 0
7-4*v^-1-2 = 0
-4*v^-1 = -5 // : -4
v^-1 = 5/4
-1 < 0
1/(v^1) = 5/4 // * v^1
1 = 5/4*v^1 // : 5/4
4/5 = v^1
v = 4/5
v = 4/5
| c/0.2=7 | | 2500=25(336-x) | | 25x+15y=-50 | | Log(4)3x=6 | | -9-4x+5x=3-1 | | -x+47=271 | | 4=x/5-1 | | -5(t-5)+7t=6t-1 | | -(3-8y)= | | 186=128-v | | 2a^2b-16ab+32= | | x+3=-(6x+6) | | 5(4x+7)-7=20x+28 | | 164-y=4 | | c=131/3/4 | | (x^2)-4x+20=0 | | -24=6y | | =t^5-6t^3+9t | | -4/(2-7x)=3 | | 3x-8=3(x-3) | | 5h-4h+4=3 | | w/2=-44 | | 4x+4000-2x=260 | | -70/(5/4) | | X(x-3)=-5 | | z+145=-90 | | -4w=-25 | | 131/3/4 | | (3-v)(5v-4)=0 | | y=7x^2-34x+24 | | 15(9n+7)=3(35+5n) | | 1/55+1/65=100x |