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b in (-oo:+oo)
149/8 = 4*b+(3/4)*b-(3/8) // - 4*b+(3/4)*b-(3/8)
149/8-(4*b)-((3/4)*b)+3/8 = 0
(-3/4)*b-4*b+149/8+3/8 = 0
19-19/4*b = 0 // - 19
-19/4*b = -19 // : -19/4
b = -19/(-19/4)
b = 4
b = 4
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