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)
60/100 = 45/x // - 45/x
60/100-(45/x) = 0
60/100-45*x^-1 = 0
-45*x^-1 = -3/5 // : -45
x^-1 = 1/75
-1 < 0
1/(x^1) = 1/75 // * x^1
1 = 1/75*x^1 // : 1/75
75 = x^1
x = 75
x = 75
| X/1.25 | | 14y-4+58=180 | | 12-c=11 | | 3x-6=4(x-3) | | a(3+2)=-2(-2)+b | | z+x=90 | | r+8=-7 | | 12x+8x+51=87 | | -27=-3pt+15-3p | | .4x-3=-17 | | -4*15y-y=7 | | 4y=2x+20 | | 5/3(x-6/25)=20 | | 0.2/0.02 | | 2.5+15=4n | | R^3-2r^2-15f=0 | | 5g-h=g | | 5/2=4d-4 | | x/153=.09/1 | | x-(20-2x)=1 | | 12+4x=30 | | 3.8(s-6)+4.66=-22 | | 153/.09=x/100 | | 6(10-3x)=186 | | -40=-12x+92 | | .09/153=100/x | | 4.2a-3.5b-(1.8a+2.7b-1.9)= | | 25-4x-6=24+9x | | 68x-60=82 | | 6x+12y=180 | | y-10=m(x-5) | | 1/2x-30=1/6x^2 |