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)
9/4 = 27/x // - 27/x
9/4-(27/x) = 0
9/4-27*x^-1 = 0
-27*x^-1 = -9/4 // : -27
x^-1 = 1/12
-1 < 0
1/(x^1) = 1/12 // * x^1
1 = 1/12*x^1 // : 1/12
12 = x^1
x = 12
x = 12
| -8/5(y-20)-1/15y= | | 5v^2=-26v-5 | | z/2=2/12 | | w/7=2/28 | | 3/6=8/y | | -w=4w^2-3 | | 9x-8-sqrt(x)=0 | | 8/12=6/d | | 1.3-2.5x=-1.1x-0.52 | | 14/28=5/c | | 8/b=2/5 | | 2/a=5/10 | | 2/9=x/18 | | n/-12=-4 | | 2/6=c/18 | | (r^2)+5r=0 | | (2A+3B)(3B-2A)=0 | | 1/3=b/18 | | 5=m/8 | | 25+x=57 | | 4(x+5)=2(-10+2x) | | H=5t^2+5t+30t | | 1/2=a/18 | | 4m+6-18-60= | | 40=t+3t^2 | | (5-u)(2u-7)=0 | | 5-4x-6=3x+7-4x | | 5(3x-6)-7=15x-37 | | 3A^2+12A+11=0 | | n+14=5 | | 750X=300 | | 4(b+3)=8 |