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a in (-oo:+oo)
(1/3)*a+7*a+8 = 172/27 // - 172/27
(1/3)*a+7*a-(172/27)+8 = 0
(1/3)*a+7*a-172/27+8 = 0
22/3*a+44/27 = 0 // - 44/27
22/3*a = -44/27 // : 22/3
a = -44/27/22/3
a = -2/9
a = -2/9
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