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b in (-oo:+oo)
6-(7*b) = b+70 // - b+70
6-(7*b)-b-70 = 0
6-7*b-b-70 = 0
-8*b-64 = 0 // + 64
-8*b = 64 // : -8
b = 64/(-8)
b = -8
b = -8
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