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X in (-oo:+oo)
5*(3*X-(1/5))^70 = 0
5*(3*X-1/5)^70 = 0
( 3*X-1/5 )
3*X-1/5 = 0 // + 1/5
3*X = 1/5 // : 3
X = 1/5/3
X = 1/15
( 5 )
5 = 0
X belongs to the empty set
X in { 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15, 1/15 }
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