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b in (-oo:+oo)
8-((1/4)*b) = 5 // - 5
8-((1/4)*b)-5 = 0
(-1/4)*b-5+8 = 0
3-1/4*b = 0 // - 3
-1/4*b = -3 // : -1/4
b = -3/(-1/4)
b = 12
b = 12
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