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a in (-oo:+oo)
(3*a)/5-1 = 3 // - 3
(3*a)/5-3-1 = 0
3/5*a-4 = 0 // + 4
3/5*a = 4 // : 3/5
a = 4/3/5
a = 20/3
a = 20/3
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