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b in (-oo:+oo)
-b-7 = 6*b+14 // - 6*b+14
-b-(6*b)-14-7 = 0
-b-6*b-14-7 = 0
-7*b-21 = 0 // + 21
-7*b = 21 // : -7
b = 21/(-7)
b = -3
b = -3
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