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^4-(3*x^7) = 0
x^4-(3*x^7) = 0
x^4-(3*x^7) = 0
x^4-3*x^7 = 0
x^4-3*x^7 = 0
x^4*(1-3*x^3) = 0
-3*x^3 = -1 // : -3
x^3 = 1/3
x^3 = 1/3 // ^ 1/3
x = (1/3)^(1/3)
x^4 = 0
1*x^4 = 0 // : 1
x^4 = 0
x = 0
x in (-oo:0) U (0:(1/3)^(1/3)) U ((1/3)^(1/3):+oo)
(-5*x^4)/(x^4-(3*x^7)) = 0
(-5*x^4)/(x^4-3*x^7) = 0
x^4-3*x^7 = 0
x^4*(1-3*x^3) = 0
-3*x^3 = -1 // : -3
x^3 = 1/3
x^3 = 1/3 // ^ 1/3
x = (1/3)^(1/3)
x^4*(x-(1/3)^(1/3)) = 0
(-5*x^4)/(x^4*(x-(1/3)^(1/3))) = 0
-5*x^4 = 0 // : -5
x^4 = 0
x = 0
x in { 0}
x belongs to the empty set
| x/1=7 | | 0.7(3x+7)=2.0-(x-3) | | x/9-4=-7 | | x/3+10=-10 | | 5/8m=28 | | 8x^6/24x^4 | | 13.32/18 | | k/-4=o | | 6a+5z=-11 | | 0.0198/22 | | -42n^2= | | 22/0.0198 | | 6*(-7)= | | -3/8k=1/2 | | (3t+1)(t-2)= | | 6(-14)-8z^4= | | 18/27 | | 27/18 | | 4x^2+8=44 | | 12-5x+6=48 | | 102=6b | | 4v^2=10v-5 | | 6x(4y+8)=12x | | 32.50/100 | | P/13=20 | | 1.8-.16a=10 | | 9z+7-(6z+6)= | | 4x-42=8 | | 23+m=47 | | 12=6-4x | | 5+(-8)-3= | | 8x-6x=4x+2 |