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a in (-oo:+oo)
(1/6)*(a-4) = (1/2)*(2*a+4) // - (1/2)*(2*a+4)
(1/6)*(a-4)-((1/2)*(2*a+4)) = 0
(1/6)*(a-4)+(-1/2)*(2*a+4) = 0
1/6*(a-4)-1/2*(2*a+4) = 0
1/6*(a-4)-1/2*(2*a+4) = 0
-5/6*a-8/3 = 0
-5/6*a-8/3 = 0
-5/6*a-8/3 = 0 // + 8/3
-5/6*a = 8/3 // : -5/6
a = 8/3/(-5/6)
a = -16/5
a = -16/5
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