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c in (-oo:+oo)
(-4/3)*(9*c-15) = 0
-4/3*(9*c-15) = 0
( -4/3 )
-4/3 = 0
c belongs to the empty set
( 9*c-15 )
9*c-15 = 0 // + 15
9*c = 15 // : 9
c = 15/9
c = 5/3
c = 5/3
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