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b in (-oo:+oo)
(3*b)/7+2*b-(5/2) = -4 // + 4
(3*b)/7+2*b-(5/2)+4 = 0
(3*b)/7+2*b-5/2+4 = 0
17/7*b+3/2 = 0 // - 3/2
17/7*b = -3/2 // : 17/7
b = -3/2/17/7
b = -21/34
b = -21/34
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