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a in (-oo:+oo)
629/10 = 6*a-((4/5)*a)+1/2 // - 6*a-((4/5)*a)+1/2
(4/5)*a-(6*a)+629/10-(1/2) = 0
(4/5)*a-6*a+629/10-1/2 = 0
312/5-26/5*a = 0 // - 312/5
-26/5*a = -312/5 // : -26/5
a = -312/5/(-26/5)
a = 12
a = 12
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