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