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b in (-oo:+oo)
64 = 7*b+2*b-8 // - 7*b+2*b-8
8-(7*b)-(2*b)+64 = 0
8-7*b-2*b+64 = 0
72-9*b = 0 // - 72
-9*b = -72 // : -9
b = -72/(-9)
b = 8
b = 8
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