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D( x )
7*98*a^2*a^6*x = 0
7*98*a^2*a^6*x = 0
7*98*a^2*a^6*x = 0
686*a^8*x = 0 // : 686*a^8
x = 0
x in (-oo:0) U (0:+oo)
(2*x^5)/(7*98*a^2*a^6*x) = 0
1/343*a^-8*x^4 = 0 // : 1/343*a^-8
x^4 = 0
x = 0
x in { 0}
x belongs to the empty set
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