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a in (-oo:+oo)
(2/7)*(14*a+7/2)-(3*a) = 9 // - 9
(2/7)*(14*a+7/2)-(3*a)-9 = 0
(2/7)*(14*a+7/2)-3*a-9 = 0
2/7*(14*a+7/2)-3*a-9 = 0
2/7*(14*a+7/2)-3*a-9 = 0
a-9+1 = 0
a-8 = 0
a-8 = 0
a-8 = 0 // + 8
a = 8
a = 8
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