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b in (-oo:+oo)
5*b-9 = -((2/7)*b)-174/7 // + -((2/7)*b)-174/7
5*b+(2/7)*b-(-174/7)-9 = 0
5*b+(2/7)*b+174/7-9 = 0
37/7*b+111/7 = 0 // - 111/7
37/7*b = -111/7 // : 37/7
b = -111/7/37/7
b = -3
b = -3
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