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a in (-oo:+oo)
4*a+a+1/10 = 13/5 // - 13/5
4*a+a+1/10-(13/5) = 0
4*a+a+1/10-13/5 = 0
5*a-5/2 = 0 // + 5/2
5*a = 5/2 // : 5
a = 5/2/5
a = 1/2
a = 1/2
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