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b in (-oo:+oo)
2*b-5 = 6*b+35 // - 6*b+35
2*b-(6*b)-35-5 = 0
2*b-6*b-35-5 = 0
-4*b-40 = 0 // + 40
-4*b = 40 // : -4
b = 40/(-4)
b = -10
b = -10
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