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)
(2/5)*x^4 = 0
2/5*x^4 = 0 // : 2/5
x^4 = 0
x = 0
x = 0
| 5v-2=4+4v | | 1/7x-5=2 | | 2k-9=k-2 | | 5x^2-24=-14x | | 120+120+100+120+(x+10)+x=360 | | (19.2-14.4i)(-3i)= | | 0.3/3 | | (12+36i)(-3i)= | | -4x+2=7-3x | | bx+c=w | | 4-3(x+8)=25 | | 6x^3+8= | | 358=2.50p+3b | | (19.2-14.4i)(4)= | | 5xsquared-4x=6 | | 12x+11=360 | | -9=-4(x-2)-(-5x+7) | | F(4)=-3 | | 3(x+6)-1=11 | | 2/9z-4/3=2 | | (12+36i)(1)= | | 5x+5x-2+y+4x+3+3x+10+y=180 | | 800x-180-180x=0 | | 5x+5x-2+y+4x+3+3x+10+y=360 | | -71.13+w=26.6 | | 2x^4dy=ydx | | 5(9r+4)=20-7r | | 6x-(x+3)=4(2x+3)-3 | | 39-a=-14 | | (2/x^3)-(36/x^5) | | t+-27=15.98 | | 40x+48= |