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)
3*x-(1/x)-5 = 3*x-(4/x) // - 3*x-(4/x)
3*x-(3*x)-(1/x)+4/x-5 = 0
3*x-3*x-x^-1+4/x-5 = 0
3*x^-1 = 5 // : 3
x^-1 = 5/3
-1 < 0
1/(x^1) = 5/3 // * x^1
1 = 5/3*x^1 // : 5/3
3/5 = x^1
x = 3/5
x = 3/5
| 0.15=0.06+0.9(y-0.06) | | x=3.15-4x | | (8x-3)/3x=2 | | 5X+20y=40000 | | l+0.4=5 | | x^2-4xy+5y^2+2y-4=0 | | m=-1.6 | | 7-y=-9 | | 10x-7=-6 | | b(2+a)= | | 25+x=2 | | l/4=-0.45 | | l/4=0.45 | | 0.11=0.065+0.85(y-0.065) | | 7z=6.9 | | (7x+8)squared+6=0 | | 7=-y/3 | | 30+8y=-7xy | | 12=5x-92x | | (4/9)^(-3/2) | | 10x-7=-6x | | 6x^2-5=-5-8x | | 4x+2(30-x)= | | 0=p+3q-6 | | y=x^2+8x-23 | | 7xy-42=0 | | x-xy=6 | | 0.75x+x=5000 | | (215.4-0.5y)+y=315.2 | | 2x+y=430.8 | | x+x-5= | | 2x+y=430 |