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b in (-oo:+oo)
1.8 = (3/5)*(b-2) // - (3/5)*(b-2)
1.8-((3/5)*(b-2)) = 0
(-3/5)*(b-2)+1.8 = 0
1.8-3/5*(b-2) = 0
1.8-3/5*(b-2) = 0
3-3/5*b = 0
3-3/5*b = 0
3-3/5*b = 0 // - 3
-3/5*b = -3 // : -3/5
b = -3/(-3/5)
b = 5
b = 5
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