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a in (-oo:+oo)
-1/2 = (4/5)*a+a-(1/5) // - (4/5)*a+a-(1/5)
1/5-((4/5)*a)-a-1/2 = 0
(-4/5)*a-a-1/2+1/5 = 0
-9/5*a-3/10 = 0 // + 3/10
-9/5*a = 3/10 // : -9/5
a = 3/10/(-9/5)
a = -1/6
a = -1/6
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