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b in (-oo:+oo)
(b+4)/7 = -3 // + 3
(b+4)/7+3 = 0
(b+4)/7+(3*7)/7 = 0
b+3*7+4 = 0
b+25 = 0
(b+25)/7 = 0
(b+25)/7 = 0 // * 7
b+25 = 0
b+25 = 0 // - 25
b = -25
b = -25
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