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b in (-oo:+oo)
1.8 = (3/5)*(b-5) // - (3/5)*(b-5)
1.8-((3/5)*(b-5)) = 0
(-3/5)*(b-5)+1.8 = 0
1.8-3/5*(b-5) = 0
1.8-3/5*(b-5) = 0
4.8-3/5*b = 0
4.8-3/5*b = 0
4.8-3/5*b = 0 // - 4.8
-3/5*b = -4.8 // : -3/5
b = -4.8/(-3/5)
b = 8
b = 8
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