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a in (-oo:+oo)
(3*a)/5-a = 4/7 // - 4/7
(3*a)/5-a-(4/7) = 0
(3*a)/5-a-4/7 = 0
-2/5*a-4/7 = 0 // + 4/7
-2/5*a = 4/7 // : -2/5
a = 4/7/(-2/5)
a = -10/7
a = -10/7
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