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)
((5/3)*x^4)/3-1 = 8 // - 8
((5/3)*x^4)/3-8-1 = 0
5/9*x^4 = 9 // : 5/9
x^4 = 81/5
x^4 = 81/5 // ^ 1/4
abs(x) = (81/5)^(1/4)
x = (81/5)^(1/4) or x = -(81/5)^(1/4)
x in { (81/5)^(1/4), -(81/5)^(1/4) }
| V+22=42 | | 4x-3=60-5x | | -4x-21=-(x-27) | | 18u+v-10=2v+u+4 | | 13u-4u=63 | | 4x+7+x=-23 | | 6u-38=4u | | R=331.51x-0.4x^2 | | 5y+14=12 | | 2v+6=3v-3 | | 20/66 | | 8x+7-2x=19 | | -(5+3x-y)+(6x-y)= | | -4y-7=14y | | 9b-12=6b | | 5w-10=75 | | (.05*2)+(.5*x)=2.5*y | | -7-10n=5n+8 | | 2X^3/Y^2^2 | | 4u+3v-2=0 | | xsquared-8x+7=0 | | 6y-2x^2/2 | | -2=3h+13 | | 4x+-18=18 | | 3w+16=73 | | a+42=15a | | 4y+3z+8x=0 | | 4+5i+3+2i=7+7i | | 5(3x-7)=10x | | 11b-24=7b | | -3=x^2+7x-9 | | 64/2598960 |