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b in (-oo:+oo)
(5/7)*b-5 = -4*b-5 // + -4*b-5
(5/7)*b-(-4*b)-5+5 = 0
(5/7)*b+4*b-5+5 = 0
33/7*b = 0 // : 33/7
b = 0
b = 0
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