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b in (-oo:+oo)
-8 = (4*b)/5 // - (4*b)/5
-((4*b)/5)-8 = 0
(-4/5)*b-8 = 0
-4/5*b-8 = 0 // + 8
-4/5*b = 8 // : -4/5
b = 8/(-4/5)
b = -10
b = -10
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