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b in (-oo:+oo)
7*b-6 = -7*b-160 // + -7*b-160
7*b-(-7*b)-6+160 = 0
7*b+7*b-6+160 = 0
14*b+154 = 0 // - 154
14*b = -154 // : 14
b = -154/14
b = -11
b = -11
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