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b in (-oo:+oo)
(-4/5)*b-6 = -14 // + 14
(-4/5)*b-6+14 = 0
8-4/5*b = 0 // - 8
-4/5*b = -8 // : -4/5
b = -8/(-4/5)
b = 10
b = 10
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