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a in (-oo:+oo)
(1/6)*(16-(4*a))-((3/4)*(20*a+12)) = 0
(1/6)*(16-4*a)+(-3/4)*(20*a+12) = 0
1/6*(16-4*a)-3/4*(20*a+12) = 0
1/6*(16-4*a)-3/4*(20*a+12) = 0
-47/3*a-19/3 = 0
-47/3*a-19/3 = 0
-47/3*a-19/3 = 0 // + 19/3
-47/3*a = 19/3 // : -47/3
a = 19/3/(-47/3)
a = -19/47
a = -19/47
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