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b in (-oo:+oo)
1.6 = (2/5)*(b-5) // - (2/5)*(b-5)
1.6-((2/5)*(b-5)) = 0
(-2/5)*(b-5)+1.6 = 0
1.6-2/5*(b-5) = 0
1.6-2/5*(b-5) = 0
3.6-2/5*b = 0
3.6-2/5*b = 0
3.6-2/5*b = 0 // - 3.6
-2/5*b = -3.6 // : -2/5
b = -3.6/(-2/5)
b = 9
b = 9
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