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a in (-oo:+oo)
(1/4)*(20-(4*a)) = 6*a // - 6*a
(1/4)*(20-(4*a))-(6*a) = 0
(1/4)*(20-4*a)-6*a = 0
1/4*(20-4*a)-6*a = 0
1/4*(20-4*a)-6*a = 0
5-7*a = 0
5-7*a = 0
5-7*a = 0 // - 5
-7*a = -5 // : -7
a = -5/(-7)
a = 5/7
a = 5/7
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