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)
7/x+3 = -14/x-3 // + -14/x-3
7/x-(-14/x)+3+3 = 0
7/x+14*x^-1+3+3 = 0
21*x^-1 = -6 // : 21
x^-1 = -2/7
-1 < 0
1/(x^1) = -2/7 // * x^1
1 = -2/7*x^1 // : -2/7
-7/2 = x^1
x = -7/2
x = -7/2
| 5(2x-4)+5x=3(x+3)-15 | | 5(n+4)+6n=97 | | 6r^2-3r-2=0 | | 4x+1=220 | | -3+10y+6=15+12y-8 | | 15-4*3+2= | | -7x+4(-3x+7)=-105 | | d^2-7d-7=0 | | -4X+10=65+X | | 5x+6=5x-6 | | 6-4(2x+3)-x=-73 | | n^2=100 | | 2y-4=7y+7 | | 9[3-(2-x)]+6x=3(5x+5)-6 | | 2y-4=7x+7 | | -s^2-6s=0 | | 3x+18=-3 | | -[9z-(19z+1)]=1+(9z+7) | | 10x+5=2x+4 | | k/4+2=6 | | -m^2+m=0 | | 2a+7=-5a+28 | | -3-5=11-7x | | 7u^2-2u-7=0 | | x+5(x+1)=59 | | 9m-9m+4m-3=1 | | 5x^2-2x+8=0 | | 8I-(8+6I)=20 | | -y^2+15y=0 | | 2/3(-2x-2)=x-13 | | 4[x-2]=2[x-3] | | -18r+8r=20 |