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b in (-oo:+oo)
-b-4 = 7*b-68 // - 7*b-68
68-b-(7*b)-4 = 0
68-b-7*b-4 = 0
64-8*b = 0 // - 64
-8*b = -64 // : -8
b = -64/(-8)
b = 8
b = 8
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