If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
72/45 = 8/w // - 8/w
72/45-(8/w) = 0
72/45-8*w^-1 = 0
-8*w^-1 = -8/5 // : -8
w^-1 = 1/5
-1 < 0
1/(w^1) = 1/5 // * w^1
1 = 1/5*w^1 // : 1/5
5 = w^1
w = 5
w = 5
| -6.5+15d+22d=4.4 | | 0=x^2+x-12 | | n/16=9 | | -4.9x^2+80x+224=0 | | (x+0.9)(x+3.4)=0 | | 4b+5=14 | | 8a^3-729b^3= | | (x+8)(x+16)=0 | | 3x^2-19200=0 | | x^2-7x+10/8-2x^2 | | x+5/2=4 | | 5-(2/3*x)=3 | | 5-(2/3x)=3 | | 10/p2=3/p+1 | | 5-2/3x=3 | | -3+3y=12 | | m^2+2m-2=0 | | 3x-8=2(16-x) | | -3x^2+6x-5=0 | | -3x^2+6x-5=y | | 4(x+1)=12-3(x-2) | | 5x+65=125 | | 36x7x/4 | | 19-6x=2x-13 | | r(20)=20(80-3*20) | | r(16)=16(80-3*16) | | x^2-14x+49-x-5=0 | | r(4)=4(80-3*4) | | r(12)=12(80-3*12) | | 1+28/x^2-4-7/x-2=0 | | r(4)=4(80-4*4) | | m+6.4=11 |