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b in (-oo:+oo)
7*(-2*b-1) = -175 // + 175
7*(-2*b-1)+175 = 0
7*(-2*b-1)+175 = 0
168-14*b = 0
168-14*b = 0
168-14*b = 0 // - 168
-14*b = -168 // : -14
b = -168/(-14)
b = 12
b = 12
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