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b in (-oo:+oo)
b/5 = -4/7 // + -4/7
b/5-(-4/7) = 0
b/5+4/7 = 0
1/5*b+4/7 = 0 // - 4/7
1/5*b = -4/7 // : 1/5
b = -4/7/1/5
b = -20/7
b = -20/7
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