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b in (-oo:+oo)
(b+12)/8-b = 12 // - 12
(b+12)/8-b-12 = 0
(b+12)/8+(8*(-b))/8+(-12*8)/8 = 0
b+8*(-b)-12*8+12 = 0
12-7*b-96 = 0
-7*b-84 = 0
(-7*b-84)/8 = 0
(-7*b-84)/8 = 0 // * 8
-7*b-84 = 0
-7*b-84 = 0 // + 84
-7*b = 84 // : -7
b = 84/(-7)
b = -12
b = -12
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