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a in (-oo:+oo)
(1/2)*(16-(4*a))-((3/4)*(20*a+12)) = 0
(1/2)*(16-4*a)+(-3/4)*(20*a+12) = 0
1/2*(16-4*a)-3/4*(20*a+12) = 0
1/2*(16-4*a)-3/4*(20*a+12) = 0
-17*a-1 = 0
-17*a-1 = 0
-17*a-1 = 0 // + 1
-17*a = 1 // : -17
a = 1/(-17)
a = -1/17
a = -1/17
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