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b in (-oo:+oo)
(-4/5)*b-6 = 14 // - 14
(-4/5)*b-14-6 = 0
-4/5*b-20 = 0 // + 20
-4/5*b = 20 // : -4/5
b = 20/(-4/5)
b = -25
b = -25
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