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b in (-oo:+oo)
5*b+(2/3)*b-2/7 = -121/7 // + -121/7
5*b+(2/3)*b-2/7-(-121/7) = 0
5*b+(2/3)*b-2/7+121/7 = 0
17/3*b+17 = 0 // - 17
17/3*b = -17 // : 17/3
b = -17/17/3
b = -3
b = -3
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