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v in (-oo:+oo)
(-1/5)*(10*v-5) = 0
-1/5*(10*v-5) = 0
( -1/5 )
-1/5 = 0
v belongs to the empty set
( 10*v-5 )
10*v-5 = 0 // + 5
10*v = 5 // : 10
v = 5/10
v = 1/2
v = 1/2
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