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b in (-oo:+oo)
(3*(2+6))/2 = 3*b-(30/4) // - 3*b-(30/4)
(3*(2+6))/2-(3*b)+30/4 = 0
(3*(2+6))/2-3*b+30/4 = 0
39/2-3*b = 0 // - 39/2
-3*b = -39/2 // : -3
b = -39/2/(-3)
b = 13/2
b = 13/2
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