If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
(7/21)*x^3 = 0
1/3*x^3 = 0 // : 1/3
x^3 = 0
x = 0
x = 0
| 18.3-4x=-6.7 | | 6b+5=-3(1-2b) | | Cos(x)=cot(x) | | 5(-1-n)=75 | | 6x^2+10x-4=o | | 4-2(8x+6)=7 | | 4y+8+y+34=180 | | 3Ln(x^2)=2 | | 3+x=6+7 | | 6x-19=3x-7 | | 75-k+10=60 | | 2u^4-2u^4w^4=0 | | 50-h+20=38 | | 3(3x-5)=47 | | 2x/^2-3x-5=0 | | 15+8n=-8+3(n+1) | | 4x^2+4y^2=0 | | Y=.36+109 | | 10t=-4.8 | | 55-t+41=62 | | 6(x+8)=13+x | | 48-t+10=34 | | -29+8v=6(v-6)-5 | | 10-g+60=64 | | N/11=3 | | 60-s+10=20 | | 72-l+20=70 | | 0.1x+0.14y=126 | | 6xwhat=300 | | y=2x-3+x^2 | | 55-z+38=62 | | Log(3x-4)=1.5 |