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