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x in (-oo:+oo)
3*((-2/5)*x-2) = 0
3*(-2/5*x-2) = 0
( -2/5*x-2 )
-2/5*x-2 = 0 // + 2
-2/5*x = 2 // : -2/5
x = 2/(-2/5)
x = -5
( 3 )
3 = 0
x belongs to the empty set
x = -5
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