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b in (-oo:+oo)
(-3/4)*b+3/8 = 69/8 // - 69/8
(-3/4)*b+3/8-(69/8) = 0
(-3/4)*b+3/8-69/8 = 0
-3/4*b-33/4 = 0 // + 33/4
-3/4*b = 33/4 // : -3/4
b = 33/4/(-3/4)
b = -11
b = -11
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