If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
155/210 = 62/y // - 62/y
155/210-(62/y) = 0
155/210-62*y^-1 = 0
-62*y^-1 = -31/42 // : -62
y^-1 = 1/84
-1 < 0
1/(y^1) = 1/84 // * y^1
1 = 1/84*y^1 // : 1/84
84 = y^1
y = 84
y = 84
| 35/m=490/616 | | x^2+6x-7=3x-3 | | 34/m=490/616 | | 34/m=490/16 | | 2x-3=53.2 | | 20logx=0.05 | | -18y^2+50=0 | | 783/t=348/232 | | 80/48=100/k | | 72/48=6/f | | 3p-15=p | | 77/d=44/48 | | 2/n=26/78 | | t/50=6/20 | | log[12](-5x-9)=log[12](-3x-1) | | H=-16t^2+15t+50 | | 30/21=w/49 | | g/27=1/3 | | 5d^7+2d^2=0 | | 7/2=c/12 | | 9p-15=-7+8p | | 2n^2+5=-38 | | 36/84=b/91 | | 2s-25=-26+s | | 4(x+7)-24= | | 21/28=s/4 | | 1/2r^2=3/2r^2-5/2r | | 21/28=s/6 | | 16t^2+96t-108=0 | | 8/y=2/6 | | 50/30=20/12 | | 30.84=3.14d/2 |