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b in (-oo:+oo)
2.25 = (3/4)*(b-5) // - (3/4)*(b-5)
2.25-((3/4)*(b-5)) = 0
(-3/4)*(b-5)+2.25 = 0
2.25-3/4*(b-5) = 0
2.25-3/4*(b-5) = 0
6-3/4*b = 0
6-3/4*b = 0
6-3/4*b = 0 // - 6
-3/4*b = -6 // : -3/4
b = -6/(-3/4)
b = 8
b = 8
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