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x in (-oo:+oo)
((x^3)/4)*(x+1) = (x^7)/4+(x^3)/4 // - (x^7)/4+(x^3)/4
((x^3)/4)*(x+1)-((x^7)/4)-((x^3)/4) = 0
1/4*x^3*(x+1)+(-x^7)/4+(-x^3)/4 = 0
(1/4*4*x^3*(x+1))/4+(-x^7)/4+(-x^3)/4 = 0
1/4*4*x^3*(x+1)-x^7-x^3 = 0
x^4-x^7+x^3-x^3 = 0
x^4-x^7 = 0
x^4-x^7 = 0
x^4*(1-x^3) = 0
-1*x^3 = -1 // : -1
x^3 = 1
x^3 = 1 // ^ 1/3
x = 1
x^4*(x-1) = 0
(x^4*(x-1))/4 = 0
(x^4*(x-1))/4 = 0 // * 4
x^4*(x-1) = 0
( x-1 )
x-1 = 0 // + 1
x = 1
( x^4 )
1*x^4 = 0 // : 1
x^4 = 0
x = 0
x in { 1, 0 }
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