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b in (-oo:+oo)
(3/4)*(b+2) = 27/8 // - 27/8
(3/4)*(b+2)-(27/8) = 0
(3/4)*(b+2)-27/8 = 0
3/4*(b+2)-27/8 = 0
(3/4*8*(b+2))/8-27/8 = 0
3/4*8*(b+2)-27 = 0
6*b-15 = 0
(6*b-15)/8 = 0
(6*b-15)/8 = 0 // * 8
6*b-15 = 0
6*b-15 = 0 // + 15
6*b = 15 // : 6
b = 15/6
b = 5/2
b = 5/2
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