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b in (-oo:+oo)
211/3 = 7*b+7*b+1/3 // - 7*b+7*b+1/3
211/3-(7*b)-(7*b)-(1/3) = 0
211/3-7*b-7*b-1/3 = 0
70-14*b = 0 // - 70
-14*b = -70 // : -14
b = -70/(-14)
b = 5
b = 5
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