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a in (-oo:+oo)
(3*a-4)/5 = -4 // + 4
(3*a-4)/5+4 = 0
(3*a-4)/5+(4*5)/5 = 0
3*a+4*5-4 = 0
3*a+16 = 0
(3*a+16)/5 = 0
(3*a+16)/5 = 0 // * 5
3*a+16 = 0
3*a+16 = 0 // - 16
3*a = -16 // : 3
a = -16/3
a = -16/3
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