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^7 = 0
x^7 = 0
x^7 = 0
1*x^7 = 0 // : 1
x^7 = 0
x = 0
x in (-oo:0) U (0:+oo)
2*6*(1/(x^7))*x^4*x^6 = 0
12*x^3 = 0 // : 12
x^3 = 0
x = 0
x in { 0}
x belongs to the empty set
| 3x+5=35-2x | | 6y=4y-20 | | 5+2x+x=20 | | 2+1/3x-5=12 | | 2+0.3x-5=12 | | -5x+2=-30 | | -5x+2=30 | | 26=2x+2x+2 | | -10/n-2=11/n+10 | | -3(2x-7)=-3x+21-3x | | 11c+7=51 | | 5c+10=45 | | 4c+5=-11 | | 5b+8=33 | | 1/6r+1/5r=11 | | 1/3-7=15 | | 11x+7y=71 | | 3(4-5x)+4x=2-(4-3x) | | 9+n=38 | | N-9=38 | | X+3y=-26 | | 8*a^2+a-1.68=0 | | 14(x-1)=196 | | 120+N=700 | | 51+n=78 | | 78+n=51 | | 7/8x=5/6 | | n-14=9 | | 9(x-1)=72 | | 6+n=50 | | 6+n=5 | | 5*(2x-4)=15 |