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b in (-oo:+oo)
(5/7)*b-3 = -16/7 // + -16/7
(5/7)*b-(-16/7)-3 = 0
(5/7)*b+16/7-3 = 0
5/7*b-5/7 = 0 // + 5/7
5/7*b = 5/7 // : 5/7
b = 5/7/5/7
b = 1
b = 1
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