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b in (-oo:+oo)
3.2 = (4/5)*(b-5) // - (4/5)*(b-5)
3.2-((4/5)*(b-5)) = 0
(-4/5)*(b-5)+3.2 = 0
3.2-4/5*(b-5) = 0
3.2-4/5*(b-5) = 0
7.2-4/5*b = 0
7.2-4/5*b = 0
7.2-4/5*b = 0 // - 7.2
-4/5*b = -7.2 // : -4/5
b = -7.2/(-4/5)
b = 9
b = 9
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