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b in (-oo:+oo)
2.25 = (3/4)*(b-2) // - (3/4)*(b-2)
2.25-((3/4)*(b-2)) = 0
(-3/4)*(b-2)+2.25 = 0
2.25-3/4*(b-2) = 0
2.25-3/4*(b-2) = 0
3.75-3/4*b = 0
3.75-3/4*b = 0
3.75-3/4*b = 0 // - 3.75
-3/4*b = -3.75 // : -3/4
b = -3.75/(-3/4)
b = 5
b = 5
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