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b in (-oo:+oo)
(2/5)*(9-(2*b))-14 = 0
(2/5)*(9-2*b)-14 = 0
2/5*(9-2*b)-14 = 0
2/5*(9-2*b)-14 = 0
-4/5*b-52/5 = 0
-4/5*b-52/5 = 0
-4/5*b-52/5 = 0 // + 52/5
-4/5*b = 52/5 // : -4/5
b = 52/5/(-4/5)
b = -13
b = -13
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