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b in (-oo:+oo)
3.75 = (3/4)*(b-2) // - (3/4)*(b-2)
3.75-((3/4)*(b-2)) = 0
(-3/4)*(b-2)+3.75 = 0
3.75-3/4*(b-2) = 0
3.75-3/4*(b-2) = 0
5.25-3/4*b = 0
5.25-3/4*b = 0
5.25-3/4*b = 0 // - 5.25
-3/4*b = -5.25 // : -3/4
b = -5.25/(-3/4)
b = 7
b = 7
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