Ответ:
(7b + 5)/(1 - 3b) + (4b + 6)/(3b - 1)=-7b+5/3b-1+4b+6/3b-1=-(7b+5)+4b+6/3b-1=3b+1/3b-1=-1
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Ответ:
(7b + 5)/(1 - 3b) + (4b + 6)/(3b - 1)=-7b+5/3b-1+4b+6/3b-1=-(7b+5)+4b+6/3b-1=3b+1/3b-1=-1