If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( i )
8-i = 0
8-i = 0
8-i = 0
8-i = 0 // - 8
-i = -8 // * -1
i = 8
i in (-oo:8) U (8:+oo)
(5-(4*i))/(8-i) = 0
(5-4*i)/(8-i) = 0
5-4*i = 0 // - 5
-4*i = -5 // : -4
i = -5/(-4)
i = 5/4
i = 5/4
| 50+6x=8 | | 7x^2+5y^2=35 | | 41x=12x^2+35 | | 8/3-x/5=1/15 | | z^2-10z+25=25 | | 4(x-2)-6=-2 | | 5x-1=5x-7 | | 4x^4-41x^2+100=0 | | 7.5-B=2.8 | | 12=5x-23+2x | | 8y^2+42y-11=0 | | 9.89-2.8x=4.5+0.4 | | 2(7x)+y=14+y | | 8y^2+42y-16=0 | | 14+y=14+y | | Y=3000(1+0.05)x | | 7+y+13y=5(7+y)-y | | T/-3=8 | | 6n^2-18no-18=6 | | x+.10x=2200 | | 6x+7c=37c | | 2x-y=14+y | | 5f-10//5=55 | | 5f-10/5=55 | | U-3.81=4.1 | | 2/3-6x= | | (19-5x)2=21 | | 2/3-6•x= | | V+4.95=8.45 | | D/2-23=-10 | | X5/10 | | Y=-16x^2+30x |