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a in (-oo:+oo)
(3*a)/25-(a/3) = -16/5 // + -16/5
(3*a)/25-(a/3)-(-16/5) = 0
(3*a)/25-(a/3)+16/5 = 0
16/5-16/75*a = 0 // - 16/5
-16/75*a = -16/5 // : -16/75
a = -16/5/(-16/75)
a = 15
a = 15
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