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b in (-oo:+oo)
8-((2*b)/5) = 13/10 // - 13/10
8-((2*b)/5)-(13/10) = 0
(-2/5)*b-13/10+8 = 0
67/10-2/5*b = 0 // - 67/10
-2/5*b = -67/10 // : -2/5
b = -67/10/(-2/5)
b = 67/4
b = 67/4
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