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a in (-oo:+oo)
(1/3)*(21-(33*a)) = 6-a // - 6-a
(1/3)*(21-(33*a))+a-6 = 0
(1/3)*(21-33*a)+a-6 = 0
1/3*(21-33*a)+a-6 = 0
1/3*(21-33*a)+a-6 = 0
7-10*a-6 = 0
1-10*a = 0
1-10*a = 0
1-10*a = 0 // - 1
-10*a = -1 // : -10
a = -1/(-10)
a = 1/10
a = 1/10
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