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b in (-oo:+oo)
5*(4*b+6) = -50 // + 50
5*(4*b+6)+50 = 0
5*(4*b+6)+50 = 0
20*b+80 = 0
20*b+80 = 0
20*b+80 = 0 // - 80
20*b = -80 // : 20
b = -80/20
b = -4
b = -4
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