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a in (-oo:+oo)
1/3-3*a = 7*a-(11/2) // - 7*a-(11/2)
1/3-3*a-(7*a)+11/2 = 0
1/3-3*a-7*a+11/2 = 0
35/6-10*a = 0 // - 35/6
-10*a = -35/6 // : -10
a = -35/6/(-10)
a = 7/12
a = 7/12
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