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a in (-oo:+oo)
5*a-((1/3)*a)-1 = 25/3 // - 25/3
5*a-((1/3)*a)-(25/3)-1 = 0
5*a+(-1/3)*a-25/3-1 = 0
14/3*a-28/3 = 0 // + 28/3
14/3*a = 28/3 // : 14/3
a = 28/3/14/3
a = 2
a = 2
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