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a in (-oo:+oo)
-5/8 = 3/8-3*a-((2/3)*a) // - 3/8-3*a-((2/3)*a)
(2/3)*a-(-3*a)-5/8-(3/8) = 0
3*a+(2/3)*a-5/8-3/8 = 0
11/3*a-1 = 0 // + 1
11/3*a = 1 // : 11/3
a = 1/11/3
a = 3/11
a = 3/11
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