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b in (-oo:+oo)
(-3/8)*b+4 = 10 // - 10
(-3/8)*b-10+4 = 0
-3/8*b-6 = 0 // + 6
-3/8*b = 6 // : -3/8
b = 6/(-3/8)
b = -16
b = -16
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