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b in (-oo:+oo)
(1/2)*b+7*b+4 = -97/2 // + -97/2
(1/2)*b+7*b-(-97/2)+4 = 0
(1/2)*b+7*b+97/2+4 = 0
15/2*b+105/2 = 0 // - 105/2
15/2*b = -105/2 // : 15/2
b = -105/2/15/2
b = -7
b = -7
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