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z in (-oo:+oo)
((z^2)/5)*(3*z-(10*z)+8) = 0
((z^2)/5)*(3*z-10*z+8) = 0
1/5*z^2*(8-7*z) = 0
( 1/5*z^2 )
1/5*z^2 = 0 // : 1/5
z^2 = 0
z = 0
( 8-7*z )
8-7*z = 0 // - 8
-7*z = -8 // : -7
z = -8/(-7)
z = 8/7
z in { 0, 8/7 }
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