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y in (-oo:+oo)
((y^5)/7)*((y^2)/7-((10*y^9)/7)) = 0
((y^5)/7)*((-10/7)*y^9+(y^2)/7) = 0
1/7*y^5*(1/7*y^2-10/7*y^9) = 0
1/7*y^2-10/7*y^9 = 0
1/7*y^2*(1-10*y^7) = 0
-10*y^7 = -1 // : -10
y^7 = 1/10
y^7 = 1/10 // ^ 1/7
y = (1/10)^(1/7)
1/7*y^2*(y-(1/10)^(1/7)) = 0
1/7*1/7*y^2*y^5*(y-(1/10)^(1/7)) = 0
( 1/7*y^2 )
1/7*y^2 = 0 // : 1/7
y^2 = 0
y = 0
( 1/7*y^5 )
1/7*y^5 = 0 // : 1/7
y^5 = 0
y = 0
( y-(1/10)^(1/7) )
y-(1/10)^(1/7) = 0 // + (1/10)^(1/7)
y = (1/10)^(1/7)
y in { 0, 0, (1/10)^(1/7) }
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