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a in (-oo:+oo)
a*((64-(2*a))/2) = 0
a*((64-2*a)/2) = 0
(a*(64-2*a))/2 = 0
( 64-2*a )
64-2*a = 0 // - 64
-2*a = -64 // : -2
a = -64/(-2)
a = 32
( a )
a = 0
a in { 32, 0 }
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