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