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)
9 = 72/x // - 72/x
9-(72/x) = 0
9-72*x^-1 = 0
-72*x^-1 = -9 // : -72
x^-1 = 1/8
-1 < 0
1/(x^1) = 1/8 // * x^1
1 = 1/8*x^1 // : 1/8
8 = x^1
x = 8
x = 8
| 2(l+w)=85 | | 4,000/500= | | 4(s-15)+6=10 | | (x^(7/3))^(9/14) | | Q/6=108 | | 14-3m+2m-10-5m= | | 12+13x=56 | | -11w-17w+(-14)=14 | | 17q-15q=4 | | 3x-6-1=2-5x+30 | | 2f-5/6=0 | | 2f-5/6 | | n/6-411 | | 9x^2+2t=5t^3 | | 16x=2x-52 | | a+2b+a+b-2a= | | -5u-1=4 | | 4x^2+88x+180=0 | | 7x-3x=2x+2x+8-6 | | 12x+-3y=3 | | ln(5y^2x^4/7z) | | B/10-7=-4 | | 2/3and18/27 | | x^15-17=7 | | P-6/2=4 | | 21/8=x/6 | | T+3t=20 | | 7+6x+5x=84 | | x/15-17=7 | | 25x-5=13x-5 | | A/17=13/26 | | (5v-3)(7+v)=0 |