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a in (-oo:+oo)
((a^7)/70)*(a-3) = 0
1/70*a^7*(a-3) = 0
( 1/70*a^7 )
1/70*a^7 = 0 // : 1/70
a^7 = 0
a = 0
( a-3 )
a-3 = 0 // + 3
a = 3
a in { 0, 3 }
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