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a in (-oo:+oo)
(1/4)*(20-(4*a))-a-6 = 0
(1/4)*(20-4*a)-a-6 = 0
1/4*(20-4*a)-a-6 = 0
1/4*(20-4*a)-a-6 = 0
5-2*a-6 = 0
-2*a-1 = 0
-2*a-1 = 0
-2*a-1 = 0 // + 1
-2*a = 1 // : -2
a = 1/(-2)
a = -1/2
a = -1/2
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