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b in (-oo:+oo)
-b-6 = 6*b+50 // - 6*b+50
-b-(6*b)-50-6 = 0
-b-6*b-50-6 = 0
-7*b-56 = 0 // + 56
-7*b = 56 // : -7
b = 56/(-7)
b = -8
b = -8
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