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b in (-oo:+oo)
(3/4)*b-8 = -b-57/8 // + -b-57/8
(3/4)*b+b-(-57/8)-8 = 0
(3/4)*b+b+57/8-8 = 0
7/4*b-7/8 = 0 // + 7/8
7/4*b = 7/8 // : 7/4
b = 7/8/7/4
b = 1/2
b = 1/2
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