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x in (-oo:+oo)
((-10/3)*(8*x-15))/20 = 0
(-10/3*(8*x-15))/20 = 0
( -10/3 )
-10/3 = 0
x belongs to the empty set
( 8*x-15 )
8*x-15 = 0 // + 15
8*x = 15 // : 8
x = 15/8
x = 15/8
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