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a in (-oo:+oo)
5*a+1/3 = 61/3 // - 61/3
5*a+1/3-(61/3) = 0
5*a+1/3-61/3 = 0
5*a-20 = 0 // + 20
5*a = 20 // : 5
a = 20/5
a = 4
a = 4
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