If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x = (23/8)*x+3 // - (23/8)*x+3
4/x-((23/8)*x)-3 = 0
(-23/8)*x+4/x-3 = 0
4*x^-1-23/8*x^1-3*x^0 = 0
(4*x^0-23/8*x^2-3*x^1)/(x^1) = 0 // * x^2
x^1*(4*x^0-23/8*x^2-3*x^1) = 0
x^1
(-23/8)*x^2-3*x+4 = 0
(-23/8)*x^2-3*x+4 = 0
DELTA = (-3)^2-(4*4*(-23/8))
DELTA = 55
DELTA > 0
x = (55^(1/2)+3)/(2*(-23/8)) or x = (3-55^(1/2))/(2*(-23/8))
x = -4/23*(55^(1/2)+3) or x = -4/23*(3-55^(1/2))
x in { -4/23*(55^(1/2)+3), -4/23*(3-55^(1/2))}
x in { -4/23*(55^(1/2)+3), -4/23*(3-55^(1/2)) }
| (2x+3)=13-x | | -(6y+2)-(-5y-7)=-2 | | 57=(1576)(23/180)r | | -(4y+2)-(-3y-7)=1 | | 3/x=9/(5x)+2 | | 57=(9062/45)r | | 3+x=10-(.166x) | | -1/16(x-18)+1/2(x+2)=x+4 | | simplyx=5+2y | | 96=(3x+1)(x+1) | | -2(2c-4)=0.34(-12c+24) | | 5x-10y=25 | | 32+4X=240 | | 18(10-.75y)+6y=120 | | 5+3x-12=11 | | x^2-36x+128=x | | -4(6y-5)-y=-2(y-4) | | 1(3+s)=4s | | 6x-8x+8=x-8+16 | | x+9=2+3(x-4) | | 1/2(6x-10)=1/3(15x-9) | | -32-9(3h+2)+4= | | 5/6x-1/5x+4=7/10 | | 5=x^3-2x+10 | | 3x/5=x/4+7 | | 15=4(x-2)-(x-5) | | -32/5+(-7) | | 2y+13=0 | | 3=.5-2 | | 4x+5=2x+39 | | X+(0.5*x)=10000 | | 0.03=0.01+(x-0.01)*0.01 |