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