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b in (-oo:+oo)
89/8 = 4*b+7*b+7 // - 4*b+7*b+7
89/8-(4*b)-(7*b)-7 = 0
89/8-4*b-7*b-7 = 0
33/8-11*b = 0 // - 33/8
-11*b = -33/8 // : -11
b = -33/8/(-11)
b = 3/8
b = 3/8
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