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)
(4*x)/x-1 = 13 // - 13
(4*x)/x-13-1 = 0
-10 = 0
x belongs to the empty set
x belongs to the empty set
| 3(2x+20)=40 | | 10=m/5+2 | | -b+2=-1/2 | | 4x^2-40x-8=0 | | 4+3y=y | | 16/0.8-x/0.8 | | x=16-0.8y | | 5(2+42)=85 | | =2x^2+11x+14 | | 208-6x=30x+20 | | 2x^2+6x+10=18 | | 9+9=41+x | | lgx+lg(7x-4)=2*lg(2x+1) | | lgx+lg(5x+8)=2*lg(5x-4) | | 2x=5-7x | | 168*9=x | | X^2=182+x | | 168*9= | | 168*7= | | 1500:168= | | 1500*4= | | 24*14=0 | | b/2-3=-1 | | 3(5x-4)-14x=5 | | 29-3x=5x+5 | | 20x-7=33 | | 2x=10/x+8 | | 6(2x-3)=20x+6 | | 7y+x=14 | | 8.6x-4=7.6x+5 | | 101325=x*9.82/0.1 | | xy-2x-4y=0 |