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b in (-oo:+oo)
5*(1/4)*b+11 = 19 // - 19
5*(1/4)*b-19+11 = 0
5/4*b-8 = 0 // + 8
5/4*b = 8 // : 5/4
b = 8/5/4
b = 32/5
b = 32/5
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