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a in (-oo:+oo)
(3/5)*a+a+2 = 13/5 // - 13/5
(3/5)*a+a-(13/5)+2 = 0
(3/5)*a+a-13/5+2 = 0
8/5*a-3/5 = 0 // + 3/5
8/5*a = 3/5 // : 8/5
a = 3/5/8/5
a = 3/8
a = 3/8
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