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)
(5/2)*y-7 = 3/y // - 3/y
(5/2)*y-(3/y)-7 = 0
(5/2)*y-3*y^-1-7 = 0
5/2*y^1-3*y^-1-7*y^0 = 0
(5/2*y^2-7*y^1-3*y^0)/(y^1) = 0 // * y^2
y^1*(5/2*y^2-7*y^1-3*y^0) = 0
y^1
(5/2)*y^2-7*y-3 = 0
(5/2)*y^2-7*y-3 = 0
DELTA = (-7)^2-(-3*4*(5/2))
DELTA = 79
DELTA > 0
y = (79^(1/2)+7)/(2*(5/2)) or y = (7-79^(1/2))/(2*(5/2))
y = (79^(1/2)+7)/5 or y = (7-79^(1/2))/5
y in { (7-79^(1/2))/5, (79^(1/2)+7)/5}
y in { (7-79^(1/2))/5, (79^(1/2)+7)/5 }
| 0.45s=9.25 | | .05x+.26(300)=.25(156) | | 24-6r=24-r | | .05x+.24(300)=.25(156) | | s=0.45+9.25 | | 5-3/4x=7/12 | | -18=-3u | | 3x-4-2x+10=6x-2x+10 | | (-3)=x(2)+-1x | | 4(y-7)=7y-31 | | f(-3)=x(2)-x | | 2d+5=14 | | x-m=4nx+3 | | 7(y-1)=2y+13 | | 2d+5=4 | | y-9=13(x+3) | | 5n^2-6n=32 | | 6x-6+5x+8=180 | | 7-10x=-5x+9 | | x-3/2=x=8/6 | | -4(y-2)=5y-37 | | 8(4x-6)=96x | | x(1)+y=1 | | 1.07(1.26)(5-x)=6 | | 48=1/6x | | 8(3y+1)=2(8+3y) | | 4=r/3 | | 3x-12=2x-5 | | X(0)+y=1 | | 6d^2+21d=10d+36 | | x=9/4x-27 | | Log(5)(5x-8)=1 |