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b in (-oo:+oo)
(3/4)*(b+20) = 16 // - 16
(3/4)*(b+20)-16 = 0
3/4*(b+20)-16 = 0
3/4*(b+20)-16 = 0
3/4*b-1 = 0
3/4*b-1 = 0
3/4*b-1 = 0 // + 1
3/4*b = 1 // : 3/4
b = 1/3/4
b = 4/3
b = 4/3
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