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b in (-oo:+oo)
-40 = (8/5)*b // - (8/5)*b
-((8/5)*b)-40 = 0
(-8/5)*b-40 = 0
-8/5*b-40 = 0 // + 40
-8/5*b = 40 // : -8/5
b = 40/(-8/5)
b = -25
b = -25
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