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a in (-oo:+oo)
(1/5)*a-4*a+10 = 602/45 // - 602/45
(1/5)*a-4*a-(602/45)+10 = 0
(1/5)*a-4*a-602/45+10 = 0
-19/5*a-152/45 = 0 // + 152/45
-19/5*a = 152/45 // : -19/5
a = 152/45/(-19/5)
a = -8/9
a = -8/9
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