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a in (-oo:+oo)
(1/5)*a+3 = 16/5 // - 16/5
(1/5)*a-(16/5)+3 = 0
(1/5)*a-16/5+3 = 0
1/5*a-1/5 = 0 // + 1/5
1/5*a = 1/5 // : 1/5
a = 1/5/1/5
a = 1
a = 1
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