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b in (-oo:+oo)
(3/8)*b+18 = (-2/1)/4 // - (-2/1)/4
(3/8)*b-((-2/1)/4)+18 = 0
(3/8)*b+1/2+18 = 0
3/8*b+37/2 = 0 // - 37/2
3/8*b = -37/2 // : 3/8
b = -37/2/3/8
b = -148/3
b = -148/3
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